leetcode-problems

String


0022-generate-parentheses
0208-implement-trie-prefix-tree
0271-encode-and-decode-strings
0344-reverse-string
0409-longest-palindrome
0424-longest-repeating-character-replacement
0647-palindromic-substrings
0648-replace-words
1044-find-common-characters
2572-append-characters-to-string-to-make-subsequence
2890-count-substrings-without-repeating-character
3379-score-of-a-string

Array


0053-maximum-subarray
0066-plus-one
0075-sort-colors
0215-kth-largest-element-in-an-array
0220-contains-duplicate-iii
0238-product-of-array-except-self
0239-sliding-window-maximum
0252-meeting-rooms
0253-meeting-rooms-ii
0271-encode-and-decode-strings
0307-range-sum-query-mutable
0322-coin-change
0330-patching-array
0435-non-overlapping-intervals
0502-ipo
0523-continuous-subarray-sum
0648-replace-words
0739-daily-temperatures
0876-hand-of-straights
1014-k-closest-points-to-origin
1037-minimum-number-of-k-consecutive-bit-flips
1044-find-common-characters
1056-capacity-to-ship-packages-within-d-days
1127-last-stone-weight
1217-relative-sort-array
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls
1719-put-boxes-into-the-warehouse-ii
2071-longest-common-subsequence-between-sorted-arrays
3461-find-the-minimum-area-to-cover-all-ones-i
3471-minimum-average-of-smallest-and-largest-elements

Hash Table


0208-implement-trie-prefix-tree
0359-logger-rate-limiter
0409-longest-palindrome
0424-longest-repeating-character-replacement
0523-continuous-subarray-sum
0648-replace-words
0876-hand-of-straights
1044-find-common-characters
1217-relative-sort-array
2071-longest-common-subsequence-between-sorted-arrays
2890-count-substrings-without-repeating-character

Counting


2071-longest-common-subsequence-between-sorted-arrays

Two Pointers


0075-sort-colors
0253-meeting-rooms-ii
0295-find-median-from-data-stream
0344-reverse-string
0633-sum-of-square-numbers
0647-palindromic-substrings
2572-append-characters-to-string-to-make-subsequence
3471-minimum-average-of-smallest-and-largest-elements

Design


0208-implement-trie-prefix-tree
0271-encode-and-decode-strings
0295-find-median-from-data-stream
0307-range-sum-query-mutable
0359-logger-rate-limiter

Trie


0208-implement-trie-prefix-tree
0648-replace-words

Heap (Priority Queue)


0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0253-meeting-rooms-ii
0295-find-median-from-data-stream
0502-ipo
1014-k-closest-points-to-origin
1127-last-stone-weight
2379-maximum-total-importance-of-roads

Divide and Conquer


0053-maximum-subarray
0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin
1285-balance-a-binary-search-tree

Dynamic Programming


0022-generate-parentheses
0053-maximum-subarray
0322-coin-change
0435-non-overlapping-intervals
0647-palindromic-substrings

Greedy


0253-meeting-rooms-ii
0330-patching-array
0409-longest-palindrome
0435-non-overlapping-intervals
0502-ipo
0876-hand-of-straights
1285-balance-a-binary-search-tree
1719-put-boxes-into-the-warehouse-ii
2379-maximum-total-importance-of-roads
2572-append-characters-to-string-to-make-subsequence

Sorting


0075-sort-colors
0215-kth-largest-element-in-an-array
0220-contains-duplicate-iii
0252-meeting-rooms
0253-meeting-rooms-ii
0295-find-median-from-data-stream
0435-non-overlapping-intervals
0502-ipo
0876-hand-of-straights
1014-k-closest-points-to-origin
1217-relative-sort-array
1675-magnetic-force-between-two-balls
1719-put-boxes-into-the-warehouse-ii
2379-maximum-total-importance-of-roads
3471-minimum-average-of-smallest-and-largest-elements

Math


0066-plus-one
0523-continuous-subarray-sum
0633-sum-of-square-numbers
1014-k-closest-points-to-origin

Geometry


1014-k-closest-points-to-origin

Quickselect


0215-kth-largest-element-in-an-array
1014-k-closest-points-to-origin

Prefix Sum


0238-product-of-array-except-self
0253-meeting-rooms-ii
0523-continuous-subarray-sum
1037-minimum-number-of-k-consecutive-bit-flips

Backtracking


0022-generate-parentheses

Stack


0739-daily-temperatures

Monotonic Stack


0739-daily-temperatures

Sliding Window


0220-contains-duplicate-iii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
1037-minimum-number-of-k-consecutive-bit-flips
2890-count-substrings-without-repeating-character

Counting Sort


1217-relative-sort-array

Data Stream


0295-find-median-from-data-stream
0359-logger-rate-limiter

Binary Indexed Tree


0307-range-sum-query-mutable

Segment Tree


0307-range-sum-query-mutable

Linked List


0021-merge-two-sorted-lists

Recursion


0021-merge-two-sorted-lists

Binary Search


0633-sum-of-square-numbers
1056-capacity-to-ship-packages-within-d-days
1605-minimum-number-of-days-to-make-m-bouquets
1675-magnetic-force-between-two-balls

Queue


0239-sliding-window-maximum
1037-minimum-number-of-k-consecutive-bit-flips

Monotonic Queue


0239-sliding-window-maximum

Bucket Sort


0220-contains-duplicate-iii

Ordered Set


0220-contains-duplicate-iii

Bit Manipulation


1037-minimum-number-of-k-consecutive-bit-flips

Tree


0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Depth-First Search


0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Search Tree


0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Binary Tree


0975-range-sum-of-bst
1114-binary-search-tree-to-greater-sum-tree
1285-balance-a-binary-search-tree

Breadth-First Search


0322-coin-change

Matrix


3461-find-the-minimum-area-to-cover-all-ones-i

Graph


2379-maximum-total-importance-of-roads

LeetCode Topics

Linked List


0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs
0061-rotate-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0146-lru-cache
0432-all-oone-data-structure
0460-lfu-cache
0716-max-stack
0725-split-linked-list-in-parts
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0766-flatten-a-multilevel-doubly-linked-list
0816-design-hashset
0817-design-hashmap
0859-design-circular-deque
0908-middle-of-the-linked-list
1411-convert-binary-number-in-a-linked-list-to-integer
1484-linked-list-in-binary-tree
1582-design-browser-history
1774-add-two-polynomials-represented-as-linked-lists
1905-design-authentication-manager
1982-remove-duplicates-from-an-unsorted-linked-list
2182-find-the-minimum-and-maximum-number-of-nodes-between-critical-points
2299-merge-nodes-in-between-zeros
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Depth-First Search


0079-word-search
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0133-clone-graph
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0156-binary-tree-upside-down
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0211-design-add-and-search-words-data-structure
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0261-graph-valid-tree
0269-alien-dictionary
0272-closest-binary-search-tree-value-ii
0297-serialize-and-deserialize-binary-tree
0302-smallest-rectangle-enclosing-black-pixels
0314-binary-tree-vertical-order-traversal
0323-number-of-connected-components-in-an-undirected-graph
0332-reconstruct-itinerary
0339-nested-list-weight-sum
0341-flatten-nested-list-iterator
0364-nested-list-weight-sum-ii
0366-find-leaves-of-binary-tree
0386-lexicographical-numbers
0399-evaluate-division
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0472-concatenated-words
0543-diameter-of-binary-tree
0547-number-of-provinces
0565-array-nesting
0572-subtree-of-another-tree
0653-two-sum-iv-input-is-a-bst
0666-path-sum-iv
0671-second-minimum-node-in-a-binary-tree
0684-redundant-connection
0695-max-area-of-island
0721-accounts-merge
0744-network-delay-time
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0766-flatten-a-multilevel-doubly-linked-list
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0803-cheapest-flights-within-k-stops
0854-making-a-large-island
0893-all-nodes-distance-k-in-binary-tree
0975-range-sum-of-bst
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1029-vertical-order-traversal-of-a-binary-tree
1079-sum-of-root-to-leaf-binary-numbers
1093-recover-a-tree-from-preorder-traversal
1190-smallest-common-region
1218-lowest-common-ancestor-of-deepest-leaves
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1544-count-good-nodes-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
1691-minimum-number-of-days-to-disconnect-island
1780-lowest-common-ancestor-of-a-binary-tree-ii
1816-lowest-common-ancestor-of-a-binary-tree-iv
1883-find-distance-in-a-binary-tree
2009-longest-word-with-all-prefixes
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2493-reverse-odd-levels-of-binary-tree
2677-cousins-in-binary-tree-ii
2793-count-the-number-of-complete-components
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3809-properties-graph

Doubly-Linked List


0146-lru-cache
0432-all-oone-data-structure
0460-lfu-cache
0716-max-stack
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0766-flatten-a-multilevel-doubly-linked-list
1582-design-browser-history
1905-design-authentication-manager

Breadth-First Search


0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0111-minimum-depth-of-binary-tree
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0127-word-ladder
0133-clone-graph
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0261-graph-valid-tree
0269-alien-dictionary
0286-walls-and-gates
0297-serialize-and-deserialize-binary-tree
0302-smallest-rectangle-enclosing-black-pixels
0314-binary-tree-vertical-order-traversal
0317-shortest-distance-from-all-buildings
0322-coin-change
0323-number-of-connected-components-in-an-undirected-graph
0339-nested-list-weight-sum
0364-nested-list-weight-sum-ii
0399-evaluate-division
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0433-minimum-genetic-mutation
0547-number-of-provinces
0653-two-sum-iv-input-is-a-bst
0684-redundant-connection
0695-max-area-of-island
0721-accounts-merge
0744-network-delay-time
0803-cheapest-flights-within-k-stops
0833-bus-routes
0854-making-a-large-island
0893-all-nodes-distance-k-in-binary-tree
0999-regions-cut-by-slashes
1029-vertical-order-traversal-of-a-binary-tree
1036-rotting-oranges
1190-smallest-common-region
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1484-linked-list-in-binary-tree
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1544-count-good-nodes-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
1883-find-distance-in-a-binary-tree
2171-second-minimum-time-to-reach-destination
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2588-maximum-number-of-points-from-grid-queries
2677-cousins-in-binary-tree-ii
2793-count-the-number-of-complete-components
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii
3809-properties-graph

Graph


0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0261-graph-valid-tree
0269-alien-dictionary
0277-find-the-celebrity
0323-number-of-connected-components-in-an-undirected-graph
0332-reconstruct-itinerary
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0744-network-delay-time
0803-cheapest-flights-within-k-stops
0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2090-number-of-ways-to-arrive-at-destination
2171-second-minimum-time-to-reach-destination
2220-find-all-possible-recipes-from-given-supplies
2230-minimum-cost-to-reach-city-with-discounts
2506-minimize-maximum-value-in-a-grid
2793-count-the-number-of-complete-components
2880-find-the-closest-marked-node
3235-minimum-cost-to-convert-string-i
3348-minimum-cost-walk-in-weighted-graph
3809-properties-graph

Topological Sort


0207-course-schedule
0210-course-schedule-ii
0269-alien-dictionary
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
2090-number-of-ways-to-arrive-at-destination
2220-find-all-possible-recipes-from-given-supplies
2506-minimize-maximum-value-in-a-grid

Union Find


0128-longest-consecutive-sequence
0200-number-of-islands
0261-graph-valid-tree
0323-number-of-connected-components-in-an-undirected-graph
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0695-max-area-of-island
0721-accounts-merge
0854-making-a-large-island
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1058-lexicographically-smallest-equivalent-string
1085-the-earliest-moment-when-everyone-become-friends
1701-remove-max-number-of-edges-to-keep-graph-fully-traversable
1706-min-cost-to-connect-all-points
2506-minimize-maximum-value-in-a-grid
2588-maximum-number-of-points-from-grid-queries
2793-count-the-number-of-complete-components
3348-minimum-cost-walk-in-weighted-graph
3809-properties-graph

Tree


0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0156-binary-tree-upside-down
0173-binary-search-tree-iterator
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0297-serialize-and-deserialize-binary-tree
0314-binary-tree-vertical-order-traversal
0341-flatten-nested-list-iterator
0366-find-leaves-of-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0653-two-sum-iv-input-is-a-bst
0666-path-sum-iv
0671-second-minimum-node-in-a-binary-tree
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0791-split-bst
0893-all-nodes-distance-k-in-binary-tree
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0975-range-sum-of-bst
1029-vertical-order-traversal-of-a-binary-tree
1079-sum-of-root-to-leaf-binary-numbers
1093-recover-a-tree-from-preorder-traversal
1190-smallest-common-region
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1484-linked-list-in-binary-tree
1544-count-good-nodes-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
1780-lowest-common-ancestor-of-a-binary-tree-ii
1790-lowest-common-ancestor-of-a-binary-tree-iii
1816-lowest-common-ancestor-of-a-binary-tree-iv
1883-find-distance-in-a-binary-tree
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2677-cousins-in-binary-tree-ii
3307-find-the-maximum-sum-of-node-values
3645-maximize-the-number-of-target-nodes-after-connecting-trees-ii

Binary Search Tree


0004-median-of-two-sorted-arrays
0034-find-first-and-last-position-of-element-in-sorted-array
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0173-binary-search-tree-iterator
0209-minimum-size-subarray-sum
0235-lowest-common-ancestor-of-a-binary-search-tree
0255-verify-preorder-sequence-in-binary-search-tree
0268-missing-number
0272-closest-binary-search-tree-value-ii
0275-h-index-ii
0300-longest-increasing-subsequence
0302-smallest-rectangle-enclosing-black-pixels
0350-intersection-of-two-arrays-ii
0362-design-hit-counter
0653-two-sum-iv-input-is-a-bst
0658-find-k-closest-elements
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0745-find-smallest-letter-greater-than-target
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0789-kth-largest-element-in-a-stream
0791-split-bst
0892-shortest-subarray-with-sum-at-least-k
0912-random-pick-with-weight
0975-range-sum-of-bst
1023-time-based-key-value-store
1046-max-consecutive-ones-iii
1051-shortest-way-to-form-string
1060-longest-repeating-substring
1143-find-smallest-common-element-in-all-rows
1149-intersection-of-three-sorted-arrays
1352-maximum-profit-in-job-scheduling
1615-range-sum-of-sorted-subarray-sums
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1766-minimum-number-of-removals-to-make-mountain-array
1966-frequency-of-the-most-frequent-element
2006-find-the-student-that-will-replace-the-chalk
2045-cutting-ribbons
2180-maximum-number-of-tasks-you-can-assign
2280-count-good-triplets-in-an-array
2394-count-subarrays-with-score-less-than-k
2498-smallest-subarrays-with-maximum-bitwise-or
2614-maximum-count-of-positive-integer-and-negative-integer
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2690-house-robber-iv
2699-count-the-number-of-fair-pairs
3081-minimum-array-length-after-pair-removals
3267-find-longest-special-substring-that-occurs-thrice-i
3790-fruits-into-baskets-ii

Recursion


0002-add-two-numbers
0024-swap-nodes-in-pairs
0044-wildcard-matching
0050-powx-n
0231-power-of-two
0241-different-ways-to-add-parentheses
0255-verify-preorder-sequence-in-binary-search-tree
0273-integer-to-english-words
0326-power-of-three
0342-power-of-four
0394-decode-string
0791-split-bst
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2050-count-good-numbers

Binary Tree


0100-same-tree
0101-symmetric-tree
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0156-binary-tree-upside-down
0173-binary-search-tree-iterator
0226-invert-binary-tree
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0297-serialize-and-deserialize-binary-tree
0314-binary-tree-vertical-order-traversal
0366-find-leaves-of-binary-tree
0543-diameter-of-binary-tree
0572-subtree-of-another-tree
0653-two-sum-iv-input-is-a-bst
0666-path-sum-iv
0671-second-minimum-node-in-a-binary-tree
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0789-kth-largest-element-in-a-stream
0791-split-bst
0893-all-nodes-distance-k-in-binary-tree
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0975-range-sum-of-bst
1029-vertical-order-traversal-of-a-binary-tree
1079-sum-of-root-to-leaf-binary-numbers
1093-recover-a-tree-from-preorder-traversal
1218-lowest-common-ancestor-of-deepest-leaves
1387-find-elements-in-a-contaminated-binary-tree
1484-linked-list-in-binary-tree
1544-count-good-nodes-in-binary-tree
1653-number-of-good-leaf-nodes-pairs
1780-lowest-common-ancestor-of-a-binary-tree-ii
1790-lowest-common-ancestor-of-a-binary-tree-iii
1816-lowest-common-ancestor-of-a-binary-tree-iv
1883-find-distance-in-a-binary-tree
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2306-create-binary-tree-from-descriptions
2493-reverse-odd-levels-of-binary-tree
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2677-cousins-in-binary-tree-ii

Hash Table


0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
0041-first-missing-positive
0049-group-anagrams
0073-set-matrix-zeroes
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0139-word-break
0141-linked-list-cycle
0146-lru-cache
0149-max-points-on-a-line
0166-fraction-to-recurring-decimal
0187-repeated-dna-sequences
0202-happy-number
0205-isomorphic-strings
0217-contains-duplicate
0242-valid-anagram
0244-shortest-word-distance-ii
0264-ugly-number-ii
0266-palindrome-permutation
0268-missing-number
0290-word-pattern
0311-sparse-matrix-multiplication
0314-binary-tree-vertical-order-traversal
0325-maximum-size-subarray-sum-equals-k
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0359-logger-rate-limiter
0380-insert-delete-getrandom-o1
0387-first-unique-character-in-a-string
0398-random-pick-index
0421-maximum-xor-of-two-numbers-in-an-array
0432-all-oone-data-structure
0433-minimum-genetic-mutation
0448-find-all-numbers-disappeared-in-an-array
0460-lfu-cache
0496-next-greater-element-i
0500-keyboard-row
0554-brick-wall
0560-subarray-sum-equals-k
0567-permutation-in-string
0621-task-scheduler
0653-two-sum-iv-input-is-a-bst
0666-path-sum-iv
0721-accounts-merge
0726-number-of-atoms
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0816-design-hashset
0817-design-hashmap
0833-bus-routes
0893-all-nodes-distance-k-in-binary-tree
0900-reordered-power-of-2
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0952-word-subsets
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1023-time-based-key-value-store
1029-vertical-order-traversal-of-a-binary-tree
1055-pairs-of-songs-with-total-durations-divisible-by-60
1074-high-five
1084-find-k-length-substrings-with-no-repeated-characters
1098-largest-unique-number
1108-analyze-user-website-visit-pattern
1125-design-file-system
1143-find-smallest-common-element-in-all-rows
1147-flip-columns-for-maximum-number-of-equal-rows
1149-intersection-of-three-sorted-arrays
1190-smallest-common-region
1218-lowest-common-ancestor-of-deepest-leaves
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1366-first-unique-number
1387-find-elements-in-a-contaminated-binary-tree
1473-find-the-longest-substring-containing-vowels-in-even-counts
1500-count-largest-group
1502-construct-k-palindrome-strings
1556-make-two-arrays-equal-by-reversing-subarrays
1620-check-if-array-pairs-are-divisible-by-k
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1741-sort-array-by-increasing-frequency
1786-count-the-number-of-consistent-strings
1790-lowest-common-ancestor-of-a-binary-tree-iii
1816-lowest-common-ancestor-of-a-binary-tree-iv
1883-find-distance-in-a-binary-tree
1903-design-most-recently-used-queue
1905-design-authentication-manager
1915-check-if-one-string-swap-can-make-strings-equal
1982-remove-duplicates-from-an-unsorted-linked-list
2003-distinct-numbers-in-each-subarray
2079-delete-duplicate-folders-in-system
2163-kth-distinct-string-in-an-array
2169-simple-bank-system
2220-find-all-possible-recipes-from-given-supplies
2247-number-of-unique-flavors-after-sharing-k-candies
2303-unique-substrings-with-equal-digit-frequency
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2331-intersection-of-multiple-arrays
2434-design-a-number-container-system
2448-count-number-of-bad-pairs
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2502-sort-the-people
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2581-divide-players-into-teams-of-equal-skill
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2640-maximum-number-of-integers-to-choose-from-a-range-i
2677-cousins-in-binary-tree-ii
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2707-merge-two-2d-arrays-by-summing-values
2755-extra-characters-in-a-string
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3081-minimum-array-length-after-pair-removals
3227-find-missing-and-repeated-values
3247-number-of-same-end-substrings
3254-number-of-divisible-triplet-sums
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3434-find-the-number-of-distinct-colors-among-the-balls
3445-lexicographically-minimum-string-after-removing-stars
3474-better-compression-of-string
3501-delete-nodes-from-linked-list-present-in-array
3519-find-the-number-of-winning-players
3548-find-the-count-of-good-integers
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3594-identify-the-largest-outlier-in-an-array
3753-maximum-difference-between-even-and-odd-frequency-i
3809-properties-graph

Two Pointers


0005-longest-palindromic-substring
0011-container-with-most-water
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0042-trapping-rain-water
0061-rotate-list
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0141-linked-list-cycle
0189-rotate-array
0202-happy-number
0244-shortest-word-distance-ii
0251-flatten-2d-vector
0272-closest-binary-search-tree-value-ii
0277-find-the-celebrity
0283-move-zeroes
0350-intersection-of-two-arrays-ii
0360-sort-transformed-array
0408-valid-word-abbreviation
0443-string-compression
0567-permutation-in-string
0653-two-sum-iv-input-is-a-bst
0658-find-k-closest-elements
0680-valid-palindrome-ii
0719-find-k-th-smallest-pair-distance
0768-partition-labels
0868-push-dominoes
0874-backspace-string-compare
0908-middle-of-the-linked-list
0979-di-string-match
1051-shortest-way-to-form-string
1165-meeting-scheduler
1615-range-sum-of-sorted-subarray-sums
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1774-add-two-polynomials-represented-as-linked-lists
1790-lowest-common-ancestor-of-a-binary-tree-iii
1894-merge-strings-alternately
1923-sentence-similarity-iii
1972-rotating-the-box
2095-minimum-number-of-swaps-to-make-the-string-balanced
2265-partition-array-according-to-given-pivot
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
3081-minimum-array-length-after-pair-removals
3526-minimum-number-of-flips-to-make-binary-grid-palindromic-i

Array


0004-median-of-two-sorted-arrays
0011-container-with-most-water
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0034-find-first-and-last-position-of-element-in-sorted-array
0036-valid-sudoku
0039-combination-sum
0040-combination-sum-ii
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0047-permutations-ii
0049-group-anagrams
0051-n-queens
0055-jump-game
0056-merge-intervals
0059-spiral-matrix-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0078-subsets
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0090-subsets-ii
0118-pascals-triangle
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0128-longest-consecutive-sequence
0134-gas-station
0139-word-break
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0179-largest-number
0189-rotate-array
0198-house-robber
0200-number-of-islands
0204-count-primes
0209-minimum-size-subarray-sum
0217-contains-duplicate
0221-maximal-square
0238-product-of-array-except-self
0243-shortest-word-distance
0244-shortest-word-distance-ii
0251-flatten-2d-vector
0255-verify-preorder-sequence-in-binary-search-tree
0256-paint-house
0265-paint-house-ii
0268-missing-number
0269-alien-dictionary
0274-h-index
0275-h-index-ii
0283-move-zeroes
0286-walls-and-gates
0300-longest-increasing-subsequence
0302-smallest-rectangle-enclosing-black-pixels
0309-best-time-to-buy-and-sell-stock-with-cooldown
0311-sparse-matrix-multiplication
0317-shortest-distance-from-all-buildings
0322-coin-change
0325-maximum-size-subarray-sum-equals-k
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0360-sort-transformed-array
0362-design-hit-counter
0373-find-k-pairs-with-smallest-sums
0380-insert-delete-getrandom-o1
0399-evaluate-division
0407-trapping-rain-water-ii
0414-third-maximum-number
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0421-maximum-xor-of-two-numbers-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0465-optimal-account-balancing
0472-concatenated-words
0485-max-consecutive-ones
0487-max-consecutive-ones-ii
0494-target-sum
0496-next-greater-element-i
0500-keyboard-row
0518-coin-change-ii
0539-minimum-time-difference
0554-brick-wall
0560-subarray-sum-equals-k
0565-array-nesting
0566-reshape-the-matrix
0604-design-compressed-string-iterator
0605-can-place-flowers
0621-task-scheduler
0624-maximum-distance-in-arrays
0636-exclusive-time-of-functions
0658-find-k-closest-elements
0666-path-sum-iv
0695-max-area-of-island
0719-find-k-th-smallest-pair-distance
0721-accounts-merge
0729-my-calendar-i
0731-my-calendar-ii
0735-asteroid-collision
0745-find-smallest-letter-greater-than-target
0797-rabbits-in-forest
0816-design-hashset
0817-design-hashmap
0833-bus-routes
0854-making-a-large-island
0859-design-circular-deque
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0912-random-pick-with-weight
0921-spiral-matrix-iii
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0940-fruit-into-baskets
0952-word-subsets
0967-minimum-falling-path-sum
0979-di-string-match
0999-regions-cut-by-slashes
1036-rotting-oranges
1046-max-consecutive-ones-iii
1055-pairs-of-songs-with-total-durations-divisible-by-60
1074-high-five
1085-the-earliest-moment-when-everyone-become-friends
1098-largest-unique-number
1107-minimum-swaps-to-group-all-1s-together
1108-analyze-user-website-visit-pattern
1143-find-smallest-common-element-in-all-rows
1147-flip-columns-for-maximum-number-of-equal-rows
1149-intersection-of-three-sorted-arrays
1165-meeting-scheduler
1166-toss-strange-coins
1190-smallest-common-region
1196-filling-bookcase-shelves
1227-number-of-equivalent-domino-pairs
1240-stone-game-ii
1256-rank-transform-of-an-array
1288-maximum-subarray-sum-with-one-deletion
1293-three-consecutive-odds
1325-path-with-maximum-probability
1329-minimum-cost-to-move-chips-to-the-same-position
1333-sort-the-jumbled-numbers
1345-perform-string-shifts
1350-remove-sub-folders-from-the-filesystem
1352-maximum-profit-in-job-scheduling
1366-first-unique-number
1426-find-n-unique-integers-sum-up-to-zero
1435-xor-queries-of-a-subarray
1477-product-of-the-last-k-numbers
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1496-lucky-numbers-in-a-matrix
1497-design-a-stack-with-increment-operation
1511-count-number-of-teams
1514-minimum-value-to-get-positive-step-by-step-sum
1524-string-matching-in-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1582-design-browser-history
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1620-check-if-array-pairs-are-divisible-by-k
1631-number-of-sub-arrays-with-odd-sum
1656-count-good-triplets
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1691-minimum-number-of-days-to-disconnect-island
1693-sum-of-all-odd-length-subarrays
1694-make-sum-divisible-by-p
1706-min-cost-to-connect-all-points
1720-crawler-log-folder
1741-sort-array-by-increasing-frequency
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1803-average-waiting-time
1829-maximum-units-on-a-truck
1849-maximum-absolute-sum-of-any-subarray
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1903-design-most-recently-used-queue
1923-sentence-similarity-iii
1927-maximum-ascending-subarray-sum
1951-find-the-winner-of-the-circular-game
1966-frequency-of-the-most-frequent-element
1972-rotating-the-box
1993-sum-of-all-subset-xor-totals
2003-distinct-numbers-in-each-subarray
2006-find-the-student-that-will-replace-the-chalk
2012-process-tasks-using-servers
2045-cutting-ribbons
2067-maximum-number-of-points-with-cost
2079-delete-duplicate-folders-in-system
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2163-kth-distinct-string-in-an-array
2169-simple-bank-system
2170-count-number-of-maximum-bitwise-or-subsets
2180-maximum-number-of-tasks-you-can-assign
2220-find-all-possible-recipes-from-given-supplies
2247-number-of-unique-flavors-after-sharing-k-candies
2249-count-the-hidden-sequences
2255-minimum-swaps-to-group-all-1s-together-ii
2262-solving-questions-with-brainpower
2265-partition-array-according-to-given-pivot
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2292-counting-words-with-a-given-prefix
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2324-find-triangular-sum-of-an-array
2331-intersection-of-multiple-arrays
2354-minimum-health-to-beat-game
2394-count-subarrays-with-score-less-than-k
2432-number-of-zero-filled-subarrays
2448-count-number-of-bad-pairs
2465-shifting-letters-ii
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2479-meeting-rooms-iii
2494-sum-of-prefix-scores-of-strings
2498-smallest-subarrays-with-maximum-bitwise-or
2502-sort-the-people
2503-longest-subarray-with-maximum-bitwise-and
2506-minimize-maximum-value-in-a-grid
2527-count-subarrays-with-fixed-bounds
2529-range-product-queries-of-powers
2551-apply-operations-to-an-array
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2614-maximum-count-of-positive-integer-and-negative-integer
2626-count-the-number-of-good-subarrays
2640-maximum-number-of-integers-to-choose-from-a-range-i
2665-minimum-time-to-repair-cars
2674-make-the-prefix-sum-non-negative
2681-put-marbles-in-bags
2685-first-completely-painted-row-or-column
2689-rearranging-fruits
2690-house-robber-iv
2691-count-vowel-strings-in-ranges
2692-take-gifts-from-the-richest-pile
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2756-buy-two-chocolates
2823-the-knights-tour
2846-robot-collisions
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2880-find-the-closest-marked-node
2888-minimum-index-of-a-valid-split
2915-count-of-interesting-subarrays
3001-apply-operations-to-maximize-score
3081-minimum-array-length-after-pair-removals
3152-maximum-value-of-an-ordered-triplet-ii
3154-maximum-value-of-an-ordered-triplet-i
3194-find-words-containing-character
3213-count-subarrays-where-max-element-appears-at-least-k-times
3227-find-missing-and-repeated-values
3235-minimum-cost-to-convert-string-i
3247-number-of-same-end-substrings
3254-number-of-divisible-triplet-sums
3307-find-the-maximum-sum-of-node-values
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3348-minimum-cost-walk-in-weighted-graph
3372-longest-strictly-increasing-or-strictly-decreasing-subarray
3429-special-array-i
3434-find-the-number-of-distinct-colors-among-the-balls
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3501-delete-nodes-from-linked-list-present-in-array
3504-minimum-moves-to-get-a-peaceful-board
3519-find-the-number-of-winning-players
3522-find-the-power-of-k-size-subarrays-i
3526-minimum-number-of-flips-to-make-binary-grid-palindromic-i
3594-identify-the-largest-outlier-in-an-array
3606-minimum-element-after-replacement-with-digit-sum
3685-count-subarrays-of-length-three-with-a-condition
3747-maximum-difference-between-adjacent-elements-in-a-circular-array
3780-permutations-iii
3790-fruits-into-baskets-ii
3809-properties-graph
3949-minimum-number-of-primes-to-sum-to-target

Backtracking


0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0047-permutations-ii
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0254-factor-combinations
0320-generalized-abbreviation
0351-android-unlock-patterns
0465-optimal-account-balancing
0494-target-sum
0865-robot-room-cleaner
1715-split-a-string-into-the-max-number-of-unique-substrings
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2456-construct-smallest-number-from-di-string
2823-the-knights-tour
3780-permutations-iii

Bit Manipulation


0078-subsets
0090-subsets-ii
0187-repeated-dna-sequences
0190-reverse-bits
0201-bitwise-and-of-numbers-range
0231-power-of-two
0266-palindrome-permutation
0268-missing-number
0320-generalized-abbreviation
0338-counting-bits
0342-power-of-four
0351-android-unlock-patterns
0421-maximum-xor-of-two-numbers-in-an-array
0465-optimal-account-balancing
0476-number-complement
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2323-minimum-bit-flips-to-convert-number
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2503-longest-subarray-with-maximum-bitwise-and
2529-range-product-queries-of-powers
2710-minimum-operations-to-reduce-an-integer-to-0
2837-minimum-operations-to-make-the-integer-zero
3307-find-the-maximum-sum-of-node-values
3348-minimum-cost-walk-in-weighted-graph
3394-minimum-array-end
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Sorting


0018-4sum
0049-group-anagrams
0056-merge-intervals
0088-merge-sorted-array
0179-largest-number
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0274-h-index
0314-binary-tree-vertical-order-traversal
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0360-sort-transformed-array
0414-third-maximum-number
0539-minimum-time-difference
0621-task-scheduler
0658-find-k-closest-elements
0719-find-k-th-smallest-pair-distance
0721-accounts-merge
0726-number-of-atoms
0778-reorganize-string
0900-reordered-power-of-2
1029-vertical-order-traversal-of-a-binary-tree
1074-high-five
1085-the-earliest-moment-when-everyone-become-friends
1098-largest-unique-number
1108-analyze-user-website-visit-pattern
1165-meeting-scheduler
1256-rank-transform-of-an-array
1333-sort-the-jumbled-numbers
1352-maximum-profit-in-job-scheduling
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1741-sort-array-by-increasing-frequency
1829-maximum-units-on-a-truck
1966-frequency-of-the-most-frequent-element
2160-minimum-operations-to-make-a-uni-value-grid
2180-maximum-number-of-tasks-you-can-assign
2331-intersection-of-multiple-arrays
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2502-sort-the-people
2506-minimize-maximum-value-in-a-grid
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2640-maximum-number-of-integers-to-choose-from-a-range-i
2681-put-marbles-in-bags
2689-rearranging-fruits
2699-count-the-number-of-fair-pairs
2756-buy-two-chocolates
2846-robot-collisions
2888-minimum-index-of-a-valid-split
3001-apply-operations-to-maximize-score
3276-minimum-number-of-pushes-to-type-word-ii
3307-find-the-maximum-sum-of-node-values
3474-better-compression-of-string
3504-minimum-moves-to-get-a-peaceful-board

Greedy


0011-container-with-most-water
0044-wildcard-matching
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0179-largest-number
0605-can-place-flowers
0621-task-scheduler
0624-maximum-distance-in-arrays
0678-valid-parenthesis-string
0680-valid-palindrome-ii
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
0979-di-string-match
1051-shortest-way-to-form-string
1252-break-a-palindrome
1329-minimum-cost-to-move-chips-to-the-same-position
1448-maximum-69-number
1502-construct-k-palindrome-strings
1616-minimum-difference-between-largest-and-smallest-value-in-three-moves
1766-minimum-number-of-removals-to-make-mountain-array
1818-maximum-score-from-removing-substrings
1829-maximum-units-on-a-truck
1966-frequency-of-the-most-frequent-element
2088-minimum-time-to-type-word-using-special-typewriter
2089-maximum-matrix-sum
2095-minimum-number-of-swaps-to-make-the-string-balanced
2180-maximum-number-of-tasks-you-can-assign
2354-minimum-health-to-beat-game
2456-construct-smallest-number-from-di-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2640-maximum-number-of-integers-to-choose-from-a-range-i
2674-make-the-prefix-sum-non-negative
2681-put-marbles-in-bags
2689-rearranging-fruits
2710-minimum-operations-to-reduce-an-integer-to-0
2756-buy-two-chocolates
3001-apply-operations-to-maximize-score
3081-minimum-array-length-after-pair-removals
3276-minimum-number-of-pushes-to-type-word-ii
3307-find-the-maximum-sum-of-node-values
3445-lexicographically-minimum-string-after-removing-stars
3504-minimum-moves-to-get-a-peaceful-board

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0012-integer-to-roman
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0032-longest-valid-parentheses
0038-count-and-say
0044-wildcard-matching
0049-group-anagrams
0071-simplify-path
0072-edit-distance
0079-word-search
0091-decode-ways
0097-interleaving-string
0115-distinct-subsequences
0127-word-ladder
0131-palindrome-partitioning
0139-word-break
0166-fraction-to-recurring-decimal
0171-excel-sheet-column-number
0179-largest-number
0187-repeated-dna-sequences
0205-isomorphic-strings
0211-design-add-and-search-words-data-structure
0214-shortest-palindrome
0227-basic-calculator-ii
0241-different-ways-to-add-parentheses
0242-valid-anagram
0243-shortest-word-distance
0244-shortest-word-distance-ii
0266-palindrome-permutation
0269-alien-dictionary
0273-integer-to-english-words
0290-word-pattern
0297-serialize-and-deserialize-binary-tree
0320-generalized-abbreviation
0387-first-unique-character-in-a-string
0394-decode-string
0399-evaluate-division
0408-valid-word-abbreviation
0433-minimum-genetic-mutation
0443-string-compression
0472-concatenated-words
0500-keyboard-row
0516-longest-palindromic-subsequence
0539-minimum-time-difference
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0604-design-compressed-string-iterator
0664-strange-printer
0678-valid-parenthesis-string
0680-valid-palindrome-ii
0721-accounts-merge
0726-number-of-atoms
0768-partition-labels
0778-reorganize-string
0812-rotate-string
0818-similar-rgb-color
0868-push-dominoes
0874-backspace-string-compare
0920-uncommon-words-from-two-sentences
0952-word-subsets
0957-minimum-add-to-make-parentheses-valid
0979-di-string-match
1023-time-based-key-value-store
1051-shortest-way-to-form-string
1058-lexicographically-smallest-equivalent-string
1060-longest-repeating-substring
1084-find-k-length-substrings-with-no-repeated-characters
1093-recover-a-tree-from-preorder-traversal
1119-robot-bounded-in-circle
1125-design-file-system
1170-shortest-common-supersequence
1190-smallest-common-region
1197-parsing-a-boolean-expression
1250-longest-common-subsequence
1252-break-a-palindrome
1283-reformat-date
1298-reverse-substrings-between-each-pair-of-parentheses
1302-delete-characters-to-make-fancy-string
1320-remove-all-adjacent-duplicates-in-string-ii
1345-perform-string-shifts
1350-remove-sub-folders-from-the-filesystem
1371-minimum-remove-to-make-valid-parentheses
1473-find-the-longest-substring-containing-vowels-in-even-counts
1502-construct-k-palindrome-strings
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1786-count-the-number-of-consistent-strings
1818-maximum-score-from-removing-substrings
1894-merge-strings-alternately
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1923-sentence-similarity-iii
2021-remove-all-occurrences-of-a-substring
2076-sum-of-digits-of-string-after-convert
2079-delete-duplicate-folders-in-system
2088-minimum-time-to-type-word-using-special-typewriter
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2217-step-by-step-directions-from-a-binary-tree-node-to-another
2220-find-all-possible-recipes-from-given-supplies
2243-check-if-all-as-appears-before-all-bs
2292-counting-words-with-a-given-prefix
2303-unique-substrings-with-equal-digit-frequency
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2465-shifting-letters-ii
2494-sum-of-prefix-scores-of-strings
2502-sort-the-people
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2580-circular-sentence
2599-take-k-of-each-character-from-left-and-right
2691-count-vowel-strings-in-ranges
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
3194-find-words-containing-character
3235-minimum-cost-to-convert-string-i
3243-count-the-number-of-powerful-integers
3247-number-of-same-end-substrings
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits
3451-string-compression-iii
3474-better-compression-of-string
3567-convert-date-to-binary
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii
3753-maximum-difference-between-even-and-odd-frequency-i
3931-process-string-with-special-operations-i

Matrix


0036-valid-sudoku
0059-spiral-matrix-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0079-word-search
0200-number-of-islands
0221-maximal-square
0286-walls-and-gates
0302-smallest-rectangle-enclosing-black-pixels
0311-sparse-matrix-multiplication
0317-shortest-distance-from-all-buildings
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0566-reshape-the-matrix
0695-max-area-of-island
0854-making-a-large-island
0921-spiral-matrix-iii
0967-minimum-falling-path-sum
0999-regions-cut-by-slashes
1036-rotting-oranges
1143-find-smallest-common-element-in-all-rows
1147-flip-columns-for-maximum-number-of-equal-rows
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1496-lucky-numbers-in-a-matrix
1691-minimum-number-of-days-to-disconnect-island
1972-rotating-the-box
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2160-minimum-operations-to-make-a-uni-value-grid
2506-minimize-maximum-value-in-a-grid
2588-maximum-number-of-points-from-grid-queries
2685-first-completely-painted-row-or-column
2823-the-knights-tour
3227-find-missing-and-repeated-values
3526-minimum-number-of-flips-to-make-binary-grid-palindromic-i

Dynamic Programming


0005-longest-palindromic-substring
0022-generate-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0044-wildcard-matching
0045-jump-game-ii
0055-jump-game
0062-unique-paths
0064-minimum-path-sum
0072-edit-distance
0091-decode-ways
0097-interleaving-string
0115-distinct-subsequences
0118-pascals-triangle
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0131-palindrome-partitioning
0139-word-break
0152-maximum-product-subarray
0198-house-robber
0221-maximal-square
0241-different-ways-to-add-parentheses
0256-paint-house
0264-ugly-number-ii
0265-paint-house-ii
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0322-coin-change
0338-counting-bits
0351-android-unlock-patterns
0416-partition-equal-subset-sum
0465-optimal-account-balancing
0472-concatenated-words
0487-max-consecutive-ones-ii
0494-target-sum
0516-longest-palindromic-subsequence
0518-coin-change-ii
0650-2-keys-keyboard
0664-strange-printer
0678-valid-parenthesis-string
0803-cheapest-flights-within-k-stops
0806-domino-and-tromino-tiling
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
0967-minimum-falling-path-sum
1060-longest-repeating-substring
1166-toss-strange-coins
1170-shortest-common-supersequence
1196-filling-bookcase-shelves
1240-stone-game-ii
1250-longest-common-subsequence
1288-maximum-subarray-sum-with-one-deletion
1352-maximum-profit-in-job-scheduling
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1511-count-number-of-teams
1631-number-of-sub-arrays-with-odd-sum
1756-minimum-deletions-to-make-string-balanced
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
2028-the-earliest-and-latest-rounds-where-players-compete
2067-maximum-number-of-points-with-cost
2090-number-of-ways-to-arrive-at-destination
2262-solving-questions-with-brainpower
2415-count-the-number-of-ideal-arrays
2710-minimum-operations-to-reduce-an-integer-to-0
2755-extra-characters-in-a-string
3243-count-the-number-of-powerful-integers
3307-find-the-maximum-sum-of-node-values
3949-minimum-number-of-primes-to-sum-to-target

Simulation


0059-spiral-matrix-ii
0566-reshape-the-matrix
0592-fraction-addition-and-subtraction
0735-asteroid-collision
0874-backspace-string-compare
0906-walking-robot-simulation
0921-spiral-matrix-iii
1119-robot-bounded-in-circle
1667-find-kth-bit-in-nth-binary-string
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2021-remove-all-occurrences-of-a-substring
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2169-simple-bank-system
2265-partition-array-according-to-given-pivot
2299-merge-nodes-in-between-zeros
2324-find-triangular-sum-of-an-array
2479-meeting-rooms-iii
2551-apply-operations-to-an-array
2645-pass-the-pillow
2692-take-gifts-from-the-richest-pile
2846-robot-collisions
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3790-fruits-into-baskets-ii
3931-process-string-with-special-operations-i

Math


0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0050-powx-n
0062-unique-paths
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0166-fraction-to-recurring-decimal
0171-excel-sheet-column-number
0189-rotate-array
0202-happy-number
0204-count-primes
0227-basic-calculator-ii
0231-power-of-two
0241-different-ways-to-add-parentheses
0263-ugly-number
0264-ugly-number-ii
0268-missing-number
0273-integer-to-english-words
0319-bulb-switcher
0326-power-of-three
0342-power-of-four
0360-sort-transformed-array
0380-insert-delete-getrandom-o1
0398-random-pick-index
0539-minimum-time-difference
0564-find-the-closest-palindrome
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0796-reaching-points
0797-rabbits-in-forest
0818-similar-rgb-color
0866-rectangle-overlap
0900-reordered-power-of-2
0903-implement-rand10-using-rand7
0912-random-pick-with-weight
1119-robot-bounded-in-circle
1166-toss-strange-coins
1240-stone-game-ii
1329-minimum-cost-to-move-chips-to-the-same-position
1345-perform-string-shifts
1411-convert-binary-number-in-a-linked-list-to-integer
1426-find-n-unique-integers-sum-up-to-zero
1448-maximum-69-number
1477-product-of-the-last-k-numbers
1500-count-largest-group
1631-number-of-sub-arrays-with-odd-sum
1693-sum-of-all-odd-length-subarrays
1774-add-two-polynomials-represented-as-linked-lists
1889-check-if-number-is-a-sum-of-powers-of-three
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2050-count-good-numbers
2155-find-missing-observations
2160-minimum-operations-to-make-a-uni-value-grid
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
2432-number-of-zero-filled-subarrays
2448-count-number-of-bad-pairs
2610-closest-prime-numbers-in-range
2645-pass-the-pillow
2649-count-total-number-of-colored-cells
2903-insert-greatest-common-divisors-in-linked-list
3001-apply-operations-to-maximize-score
3172-divisible-and-non-divisible-sums-difference
3216-distribute-candies-among-children-iii
3227-find-missing-and-repeated-values
3243-count-the-number-of-powerful-integers
3548-find-the-count-of-good-integers
3567-convert-date-to-binary
3606-minimum-element-after-replacement-with-digit-sum
3817-maximum-containers-on-a-ship
3830-find-closest-person
3949-minimum-number-of-primes-to-sum-to-target

Queue


0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0341-flatten-nested-list-iterator
0362-design-hit-counter
0387-first-unique-character-in-a-string
0859-design-circular-deque
0892-shortest-subarray-with-sum-at-least-k
0969-number-of-recent-calls
1366-first-unique-number
1951-find-the-winner-of-the-circular-game
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Stack


0020-valid-parentheses
0032-longest-valid-parentheses
0042-trapping-rain-water
0071-simplify-path
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0150-evaluate-reverse-polish-notation
0173-binary-search-tree-iterator
0225-implement-stack-using-queues
0227-basic-calculator-ii
0232-implement-queue-using-stacks
0255-verify-preorder-sequence-in-binary-search-tree
0272-closest-binary-search-tree-value-ii
0341-flatten-nested-list-iterator
0364-nested-list-weight-sum-ii
0394-decode-string
0496-next-greater-element-i
0636-exclusive-time-of-functions
0678-valid-parenthesis-string
0716-max-stack
0726-number-of-atoms
0735-asteroid-collision
0758-convert-binary-search-tree-to-sorted-doubly-linked-list
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0874-backspace-string-compare
0957-minimum-add-to-make-parentheses-valid
1197-parsing-a-boolean-expression
1298-reverse-substrings-between-each-pair-of-parentheses
1320-remove-all-adjacent-duplicates-in-string-ii
1371-minimum-remove-to-make-valid-parentheses
1497-design-a-stack-with-increment-operation
1582-design-browser-history
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1720-crawler-log-folder
1756-minimum-deletions-to-make-string-balanced
1818-maximum-score-from-removing-substrings
1903-design-most-recently-used-queue
2021-remove-all-occurrences-of-a-substring
2095-minimum-number-of-swaps-to-make-the-string-balanced
2456-construct-smallest-number-from-di-string
2520-using-a-robot-to-print-the-lexicographically-smallest-string
2846-robot-collisions
3001-apply-operations-to-maximize-score
3445-lexicographically-minimum-string-after-removing-stars
3447-clear-digits

Combinatorics


0062-unique-paths
1993-sum-of-all-subset-xor-totals
2324-find-triangular-sum-of-an-array
2415-count-the-number-of-ideal-arrays
3216-distribute-candies-among-children-iii
3548-find-the-count-of-good-integers

Trie


0139-word-break
0211-design-add-and-search-words-data-structure
0386-lexicographical-numbers
0421-maximum-xor-of-two-numbers-in-an-array
0440-k-th-smallest-in-lexicographical-order
0472-concatenated-words
1125-design-file-system
1350-remove-sub-folders-from-the-filesystem
2009-longest-word-with-all-prefixes
2079-delete-duplicate-folders-in-system
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix

Memoization


0139-word-break
0241-different-ways-to-add-parentheses
2028-the-earliest-and-latest-rounds-where-players-compete

Divide and Conquer


0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
0190-reverse-bits
0347-top-k-frequent-elements
0925-construct-binary-tree-from-preorder-and-postorder-traversal
2280-count-good-triplets-in-an-array

Heap (Priority Queue)


0023-merge-k-sorted-lists
0264-ugly-number-ii
0272-closest-binary-search-tree-value-ii
0347-top-k-frequent-elements
0373-find-k-pairs-with-smallest-sums
0407-trapping-rain-water-ii
0621-task-scheduler
0658-find-k-closest-elements
0744-network-delay-time
0778-reorganize-string
0789-kth-largest-element-in-a-stream
0803-cheapest-flights-within-k-stops
0892-shortest-subarray-with-sum-at-least-k
1074-high-five
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2012-process-tasks-using-servers
2230-minimum-cost-to-reach-city-with-discounts
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2479-meeting-rooms-iii
2588-maximum-number-of-points-from-grid-queries
2674-make-the-prefix-sum-non-negative
2681-put-marbles-in-bags
2692-take-gifts-from-the-richest-pile
2868-continuous-subarrays
2880-find-the-closest-marked-node
3445-lexicographically-minimum-string-after-removing-stars

Shortest Path


0399-evaluate-division
0744-network-delay-time
0803-cheapest-flights-within-k-stops
1325-path-with-maximum-probability
1456-find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2090-number-of-ways-to-arrive-at-destination
2171-second-minimum-time-to-reach-destination
2230-minimum-cost-to-reach-city-with-discounts
2880-find-the-closest-marked-node
3235-minimum-cost-to-convert-string-i

Design


0146-lru-cache
0173-binary-search-tree-iterator
0211-design-add-and-search-words-data-structure
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0244-shortest-word-distance-ii
0251-flatten-2d-vector
0297-serialize-and-deserialize-binary-tree
0341-flatten-nested-list-iterator
0359-logger-rate-limiter
0362-design-hit-counter
0380-insert-delete-getrandom-o1
0432-all-oone-data-structure
0460-lfu-cache
0604-design-compressed-string-iterator
0716-max-stack
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0816-design-hashset
0817-design-hashmap
0859-design-circular-deque
0969-number-of-recent-calls
1023-time-based-key-value-store
1125-design-file-system
1366-first-unique-number
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
1497-design-a-stack-with-increment-operation
1582-design-browser-history
1903-design-most-recently-used-queue
1905-design-authentication-manager
2169-simple-bank-system
2434-design-a-number-container-system

Binary Indexed Tree


1511-count-number-of-teams
1903-design-most-recently-used-queue
2280-count-good-triplets-in-an-array

Probability and Statistics


0903-implement-rand10-using-rand7
1166-toss-strange-coins

Sliding Window


0003-longest-substring-without-repeating-characters
0187-repeated-dna-sequences
0209-minimum-size-subarray-sum
0487-max-consecutive-ones-ii
0567-permutation-in-string
0658-find-k-closest-elements
0892-shortest-subarray-with-sum-at-least-k
0940-fruit-into-baskets
1046-max-consecutive-ones-iii
1084-find-k-length-substrings-with-no-repeated-characters
1107-minimum-swaps-to-group-all-1s-together
1755-defuse-the-bomb
1966-frequency-of-the-most-frequent-element
2003-distinct-numbers-in-each-subarray
2247-number-of-unique-flavors-after-sharing-k-candies
2255-minimum-swaps-to-group-all-1s-together-ii
2394-count-subarrays-with-score-less-than-k
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
2498-smallest-subarrays-with-maximum-bitwise-or
2527-count-subarrays-with-fixed-bounds
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
3213-count-subarrays-where-max-element-appears-at-least-k-times
3267-find-longest-special-substring-that-occurs-thrice-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i
3569-count-of-substrings-containing-every-vowel-and-k-consonants-ii

Prefix Sum


0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0325-maximum-size-subarray-sum-equals-k
0560-subarray-sum-equals-k
0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
0912-random-pick-with-weight
1046-max-consecutive-ones-iii
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1477-product-of-the-last-k-numbers
1514-minimum-value-to-get-positive-step-by-step-sum
1537-maximum-score-after-splitting-a-string
1631-number-of-sub-arrays-with-odd-sum
1693-sum-of-all-odd-length-subarrays
1694-make-sum-divisible-by-p
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1966-frequency-of-the-most-frequent-element
2006-find-the-student-that-will-replace-the-chalk
2249-count-the-hidden-sequences
2394-count-subarrays-with-score-less-than-k
2465-shifting-letters-ii
2529-range-product-queries-of-powers
2691-count-vowel-strings-in-ranges
2915-count-of-interesting-subarrays
3247-number-of-same-end-substrings
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i

Rolling Hash


0187-repeated-dna-sequences
0214-shortest-palindrome
1060-longest-repeating-substring
2303-unique-substrings-with-equal-digit-frequency
3309-count-prefix-and-suffix-pairs-i

Suffix Array


1060-longest-repeating-substring

Hash Function


0187-repeated-dna-sequences
0214-shortest-palindrome
0572-subtree-of-another-tree
0816-design-hashset
0817-design-hashmap
1060-longest-repeating-substring
2079-delete-duplicate-folders-in-system
2303-unique-substrings-with-equal-digit-frequency
3309-count-prefix-and-suffix-pairs-i

Counting


0347-top-k-frequent-elements
0387-first-unique-character-in-a-string
0621-task-scheduler
0778-reorganize-string
0900-reordered-power-of-2
0920-uncommon-words-from-two-sentences
1055-pairs-of-songs-with-total-durations-divisible-by-60
1143-find-smallest-common-element-in-all-rows
1149-intersection-of-three-sorted-arrays
1227-number-of-equivalent-domino-pairs
1502-construct-k-palindrome-strings
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
1915-check-if-one-string-swap-can-make-strings-equal
2163-kth-distinct-string-in-an-array
2303-unique-substrings-with-equal-digit-frequency
2308-divide-array-into-equal-pairs
2331-intersection-of-multiple-arrays
2448-count-number-of-bad-pairs
2494-sum-of-prefix-scores-of-strings
2614-maximum-count-of-positive-integer-and-negative-integer
3081-minimum-array-length-after-pair-removals
3247-number-of-same-end-substrings
3267-find-longest-special-substring-that-occurs-thrice-i
3276-minimum-number-of-pushes-to-type-word-ii
3474-better-compression-of-string
3519-find-the-number-of-winning-players
3594-identify-the-largest-outlier-in-an-array
3753-maximum-difference-between-even-and-odd-frequency-i

Merge Sort


0023-merge-k-sorted-lists
2280-count-good-triplets-in-an-array

Bitmask


0351-android-unlock-patterns
0465-optimal-account-balancing

Strongly Connected Component


1691-minimum-number-of-days-to-disconnect-island

Counting Sort


0274-h-index
3504-minimum-moves-to-get-a-peaceful-board

Data Stream


0359-logger-rate-limiter
0362-design-hit-counter
0789-kth-largest-element-in-a-stream
0969-number-of-recent-calls
1366-first-unique-number
1477-product-of-the-last-k-numbers
1582-design-browser-history

Game Theory


1240-stone-game-ii

Geometry


0149-max-points-on-a-line
0866-rectangle-overlap

Randomized


0380-insert-delete-getrandom-o1
0398-random-pick-index
0903-implement-rand10-using-rand7
0912-random-pick-with-weight

Eulerian Circuit


0332-reconstruct-itinerary

Number Theory


0204-count-primes
2415-count-the-number-of-ideal-arrays
2610-closest-prime-numbers-in-range
2903-insert-greatest-common-divisors-in-linked-list
3001-apply-operations-to-maximize-score
3949-minimum-number-of-primes-to-sum-to-target

Brainteaser


0319-bulb-switcher
2503-longest-subarray-with-maximum-bitwise-and
2837-minimum-operations-to-make-the-integer-zero

Iterator


0173-binary-search-tree-iterator
0251-flatten-2d-vector
0341-flatten-nested-list-iterator
0604-design-compressed-string-iterator

String Matching


0214-shortest-palindrome
0572-subtree-of-another-tree
0812-rotate-string
1524-string-matching-in-an-array
2292-counting-words-with-a-given-prefix
3309-count-prefix-and-suffix-pairs-i

Segment Tree


0729-my-calendar-i
0731-my-calendar-ii
2280-count-good-triplets-in-an-array
3790-fruits-into-baskets-ii

Ordered Set


0716-max-stack
0729-my-calendar-i
0731-my-calendar-ii
1903-design-most-recently-used-queue
2280-count-good-triplets-in-an-array
2434-design-a-number-container-system
2868-continuous-subarrays
3790-fruits-into-baskets-ii

Interactive


0277-find-the-celebrity
0865-robot-room-cleaner

Monotonic Stack


0042-trapping-rain-water
0255-verify-preorder-sequence-in-binary-search-tree
0496-next-greater-element-i
1679-shortest-subarray-to-be-removed-to-make-array-sorted
3001-apply-operations-to-maximize-score

Monotonic Queue


0892-shortest-subarray-with-sum-at-least-k
2180-maximum-number-of-tasks-you-can-assign
2527-count-subarrays-with-fixed-bounds
2868-continuous-subarrays

Reservoir Sampling


0398-random-pick-index

Enumeration


0204-count-primes
0818-similar-rgb-color
0900-reordered-power-of-2
1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2170-count-number-of-maximum-bitwise-or-subsets
2837-minimum-operations-to-make-the-integer-zero
3548-find-the-count-of-good-integers
3594-identify-the-largest-outlier-in-an-array

Database


0197-rising-temperature
0577-employee-bonus
1153-product-sales-analysis-i
1415-students-and-examinations
1509-replace-employee-id-with-the-unique-identifier
1724-customer-who-visited-but-did-not-make-any-transactions
1801-average-time-of-process-per-machine
2087-confirmation-rate

Bucket Sort


0347-top-k-frequent-elements

Quickselect


0347-top-k-frequent-elements

Rejection Sampling


0903-implement-rand10-using-rand7

Minimum Spanning Tree


1706-min-cost-to-connect-all-points

Name		Name	Last commit message	Last commit date
Latest commit History 3,360 Commits
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0006-zigzag-conversion		0006-zigzag-conversion
0007-reverse-integer		0007-reverse-integer
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0009-palindrome-number		0009-palindrome-number
0011-container-with-most-water		0011-container-with-most-water
0012-integer-to-roman		0012-integer-to-roman
0015-3sum		0015-3sum
0017-letter-combinations-of-a-phone-number		0017-letter-combinations-of-a-phone-number
0018-4sum		0018-4sum
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0022-generate-parentheses		0022-generate-parentheses
0023-merge-k-sorted-lists		0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0027-remove-element		0027-remove-element
0032-longest-valid-parentheses		0032-longest-valid-parentheses
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0036-valid-sudoku		0036-valid-sudoku
0038-count-and-say		0038-count-and-say
0039-combination-sum		0039-combination-sum
0040-combination-sum-ii		0040-combination-sum-ii
0041-first-missing-positive		0041-first-missing-positive
0042-trapping-rain-water		0042-trapping-rain-water
0044-wildcard-matching		0044-wildcard-matching
0045-jump-game-ii		0045-jump-game-ii
0046-permutations		0046-permutations
0047-permutations-ii		0047-permutations-ii
0048-rotate-image		0048-rotate-image
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0051-n-queens		0051-n-queens
0053-maximum-subarray		0053-maximum-subarray
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0057-insert-interval		0057-insert-interval
0059-spiral-matrix-ii		0059-spiral-matrix-ii
0061-rotate-list		0061-rotate-list
0062-unique-paths		0062-unique-paths
0064-minimum-path-sum		0064-minimum-path-sum
0066-plus-one		0066-plus-one
0070-climbing-stairs		0070-climbing-stairs
0071-simplify-path		0071-simplify-path
0072-edit-distance		0072-edit-distance
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0076-minimum-window-substring		0076-minimum-window-substring
0078-subsets		0078-subsets
0079-word-search		0079-word-search
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array		0088-merge-sorted-array
0090-subsets-ii		0090-subsets-ii
0091-decode-ways		0091-decode-ways
0097-interleaving-string		0097-interleaving-string
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0102-binary-tree-level-order-traversal		0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal		0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal		0105-construct-binary-tree-from-preorder-and-inorder-traversal
0110-balanced-binary-tree		0110-balanced-binary-tree
0111-minimum-depth-of-binary-tree		0111-minimum-depth-of-binary-tree
0115-distinct-subsequences		0115-distinct-subsequences
0116-populating-next-right-pointers-in-each-node		0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii		0117-populating-next-right-pointers-in-each-node-ii
0118-pascals-triangle		0118-pascals-triangle
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii		0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii		0123-best-time-to-buy-and-sell-stock-iii
0124-binary-tree-maximum-path-sum		0124-binary-tree-maximum-path-sum
0125-valid-palindrome		0125-valid-palindrome
0127-word-ladder		0127-word-ladder
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0129-sum-root-to-leaf-numbers		0129-sum-root-to-leaf-numbers
0130-surrounded-regions		0130-surrounded-regions
0131-palindrome-partitioning		0131-palindrome-partitioning
0133-clone-graph		0133-clone-graph
0134-gas-station		0134-gas-station
0136-single-number		0136-single-number
0138-copy-list-with-random-pointer		0138-copy-list-with-random-pointer
0139-word-break		0139-word-break
0141-linked-list-cycle		0141-linked-list-cycle
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal		0145-binary-tree-postorder-traversal
0146-lru-cache		0146-lru-cache
0149-max-points-on-a-line		0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation		0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray		0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array		0153-find-minimum-in-rotated-sorted-array
0155-min-stack		0155-min-stack

License

bharatr21/leetcode-problems

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leetcode-problems

String

Array

Hash Table

Counting

Two Pointers

Design

Trie

Heap (Priority Queue)

Divide and Conquer

Dynamic Programming

Greedy

Sorting

Math

Geometry

Quickselect

Prefix Sum

Backtracking

Stack

Monotonic Stack

Sliding Window

Counting Sort

Data Stream

Binary Indexed Tree

Segment Tree

Linked List

Recursion

Binary Search

Queue

Monotonic Queue

Bucket Sort

Ordered Set

Bit Manipulation

Tree

Depth-First Search

Binary Search Tree

Binary Tree

Breadth-First Search

Matrix

Graph

LeetCode Topics

Linked List

Depth-First Search

Doubly-Linked List

Breadth-First Search

Graph

Topological Sort

Union Find

Tree

Binary Search Tree

Recursion

Binary Tree

Hash Table

Two Pointers

Array

Backtracking

Bit Manipulation

Sorting

Greedy

String

Matrix

Dynamic Programming

Simulation

Math

Queue

Stack

Combinatorics

Trie

Memoization

Divide and Conquer

Heap (Priority Queue)

Shortest Path

Design

Binary Indexed Tree

Packages