LeetCode

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Divide and Conquer


0004-median-of-two-sorted-arrays
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0148-sort-list
0169-majority-element
0190-reverse-bits
0191-number-of-1-bits
0772-construct-quad-tree
0954-maximum-sum-circular-subarray

Bit Manipulation


0190-reverse-bits
0191-number-of-1-bits
0201-bitwise-and-of-numbers-range
0222-count-complete-tree-nodes
0476-number-complement
1054-complement-of-base-10-integer
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1786-count-the-number-of-consistent-strings
1940-maximum-xor-for-each-query
2170-count-number-of-maximum-bitwise-or-subsets
2323-minimum-bit-flips-to-convert-number
2356-largest-combination-with-bitwise-and-greater-than-zero
2503-longest-subarray-with-maximum-bitwise-and
3291-find-if-array-can-be-sorted
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end

Array


0004-median-of-two-sorted-arrays
0011-container-with-most-water
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0036-valid-sudoku
0040-combination-sum-ii
0045-jump-game-ii
0046-permutations
0048-rotate-image
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0068-text-justification
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0084-largest-rectangle-in-histogram
0088-merge-sorted-array
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0118-pascals-triangle
0122-best-time-to-buy-and-sell-stock-ii
0130-surrounded-regions
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
0169-majority-element
0179-largest-number
0189-rotate-array
0198-house-robber
0200-number-of-islands
0209-minimum-size-subarray-sum
0212-word-search-ii
0221-maximal-square
0238-product-of-array-except-self
0283-move-zeroes
0289-game-of-life
0373-find-k-pairs-with-smallest-sums
0380-insert-delete-getrandom-o1
0399-evaluate-division
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0539-minimum-time-difference
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0735-asteroid-collision
0772-construct-quad-tree
0787-sliding-puzzle
0859-design-circular-deque
0870-magic-squares-in-grid
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0906-walking-robot-simulation
0921-spiral-matrix-iii
0945-snakes-and-ladders
0954-maximum-sum-circular-subarray
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1147-flip-columns-for-maximum-number-of-equal-rows
1196-filling-bookcase-shelves
1240-stone-game-ii
1256-rank-transform-of-an-array
1325-path-with-maximum-probability
1350-remove-sub-folders-from-the-filesystem
1402-count-square-submatrices-with-all-ones
1435-xor-queries-of-a-subarray
1497-design-a-stack-with-increment-operation
1511-count-number-of-teams
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1620-check-if-array-pairs-are-divisible-by-k
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1691-minimum-number-of-days-to-disconnect-island
1694-make-sum-divisible-by-p
1755-defuse-the-bomb
1766-minimum-number-of-removals-to-make-mountain-array
1786-count-the-number-of-consistent-strings
1798-max-number-of-k-sum-pairs
1833-find-the-highest-altitude
1923-sentence-similarity-iii
1940-maximum-xor-for-each-query
1972-rotating-the-box
2006-find-the-student-that-will-replace-the-chalk
2035-count-sub-islands
2054-the-number-of-the-smallest-unoccupied-chair
2067-maximum-number-of-points-with-cost
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2163-kth-distinct-string-in-an-array
2170-count-number-of-maximum-bitwise-or-subsets
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2255-minimum-swaps-to-group-all-1s-together-ii
2343-count-unguarded-cells-in-the-grid
2356-largest-combination-with-bitwise-and-greater-than-zero
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2503-longest-subarray-with-maximum-bitwise-and
2545-height-of-binary-tree-after-subtree-removal-queries
2552-maximum-sum-of-distinct-subarrays-with-length-k
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2616-maximal-score-after-applying-k-operations
2699-count-the-number-of-fair-pairs
2711-minimum-time-to-visit-a-cell-in-a-grid
2716-prime-subtraction-operation
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid
3235-minimum-cost-to-convert-string-i
3291-find-if-array-can-be-sorted
3329-find-the-length-of-the-longest-common-prefix
3380-shortest-subarray-with-or-at-least-k-ii
3501-delete-nodes-from-linked-list-present-in-array
3517-shortest-distance-after-road-addition-queries-i

String


0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0012-integer-to-roman
0020-valid-parentheses
0022-generate-parentheses
0030-substring-with-concatenation-of-all-words
0068-text-justification
0071-simplify-path
0072-edit-distance
0076-minimum-window-substring
0079-word-search
0097-interleaving-string
0127-word-ladder
0139-word-break
0151-reverse-words-in-a-string
0179-largest-number
0212-word-search-ii
0214-shortest-palindrome
0224-basic-calculator
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0394-decode-string
0399-evaluate-division
0433-minimum-genetic-mutation
0539-minimum-time-difference
0564-find-the-closest-palindrome
0567-permutation-in-string
0592-fraction-addition-and-subtraction
0664-strange-printer
0812-rotate-string
0920-uncommon-words-from-two-sentences
0957-minimum-add-to-make-parentheses-valid
1146-greatest-common-divisor-of-strings
1197-parsing-a-boolean-expression
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1350-remove-sub-folders-from-the-filesystem
1473-find-the-longest-substring-containing-vowels-in-even-counts
1667-find-kth-bit-in-nth-binary-string
1715-split-a-string-into-the-max-number-of-unique-substrings
1756-minimum-deletions-to-make-string-balanced
1786-count-the-number-of-consistent-strings
1894-merge-strings-alternately
1923-sentence-similarity-iii
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2163-kth-distinct-string-in-an-array
2470-removing-stars-from-a-string
2494-sum-of-prefix-scores-of-strings
2580-circular-sentence
2599-take-k-of-each-character-from-left-and-right
2727-number-of-senior-citizens
2755-extra-characters-in-a-string
2800-minimum-string-length-after-removing-substrings
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3235-minimum-cost-to-convert-string-i
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3451-string-compression-iii

Graph


0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0399-evaluate-division
0984-most-stones-removed-with-same-row-or-column
1325-path-with-maximum-probability
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3189-find-champion-ii
3235-minimum-cost-to-convert-string-i
3517-shortest-distance-after-road-addition-queries-i

Shortest Path


0399-evaluate-division
1325-path-with-maximum-probability
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights
3235-minimum-cost-to-convert-string-i

Stack


0020-valid-parentheses
0071-simplify-path
0084-largest-rectangle-in-histogram
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0145-binary-tree-postorder-traversal
0150-evaluate-reverse-polish-notation
0155-min-stack
0173-binary-search-tree-iterator
0224-basic-calculator
0394-decode-string
0735-asteroid-collision
0776-n-ary-tree-postorder-traversal
0957-minimum-add-to-make-parentheses-valid
1002-maximum-width-ramp
1197-parsing-a-boolean-expression
1497-design-a-stack-with-increment-operation
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1756-minimum-deletions-to-make-string-balanced
2095-minimum-number-of-swaps-to-make-the-string-balanced
2470-removing-stars-from-a-string
2800-minimum-string-length-after-removing-substrings

Linked List


0019-remove-nth-node-from-end-of-list
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0092-reverse-linked-list-ii
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0146-lru-cache
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0328-odd-even-linked-list
0432-all-oone-data-structure
0725-split-linked-list-in-parts
0859-design-circular-deque
1484-linked-list-in-binary-tree
2411-spiral-matrix-iv
2903-insert-greatest-common-divisors-in-linked-list
3501-delete-nodes-from-linked-list-present-in-array

Two Pointers


0005-longest-palindromic-substring
0011-container-with-most-water
0019-remove-nth-node-from-end-of-list
0061-rotate-list
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0088-merge-sorted-array
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0189-rotate-array
0283-move-zeroes
0567-permutation-in-string
0719-find-k-th-smallest-pair-distance
1615-range-sum-of-sorted-subarray-sums
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1798-max-number-of-k-sum-pairs
1894-merge-strings-alternately
1923-sentence-similarity-iii
1972-rotating-the-box
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2581-divide-players-into-teams-of-equal-skill
2699-count-the-number-of-fair-pairs
3195-separate-black-and-white-balls

Sorting


0056-merge-intervals
0088-merge-sorted-array
0148-sort-list
0169-majority-element
0179-largest-number
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0539-minimum-time-difference
0632-smallest-range-covering-elements-from-k-lists
0719-find-k-th-smallest-pair-distance
1256-rank-transform-of-an-array
1556-make-two-arrays-equal-by-reversing-subarrays
1615-range-sum-of-sorted-subarray-sums
1798-max-number-of-k-sum-pairs
2179-most-beautiful-item-for-each-query
2488-divide-intervals-into-minimum-number-of-groups
2554-minimum-total-distance-traveled
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2646-kth-largest-sum-in-a-binary-tree
2699-count-the-number-of-fair-pairs
3276-minimum-number-of-pushes-to-type-word-ii
3291-find-if-array-can-be-sorted

Hash Table


0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0030-substring-with-concatenation-of-all-words
0036-valid-sudoku
0073-set-matrix-zeroes
0076-minimum-window-substring
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0127-word-ladder
0133-clone-graph
0138-copy-list-with-random-pointer
0139-word-break
0146-lru-cache
0149-max-points-on-a-line
0160-intersection-of-two-linked-lists
0169-majority-element
0264-ugly-number-ii
0380-insert-delete-getrandom-o1
0432-all-oone-data-structure
0433-minimum-genetic-mutation
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0870-magic-squares-in-grid
0906-walking-robot-simulation
0920-uncommon-words-from-two-sentences
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
1147-flip-columns-for-maximum-number-of-equal-rows
1256-rank-transform-of-an-array
1473-find-the-longest-substring-containing-vowels-in-even-counts
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
1786-count-the-number-of-consistent-strings
1798-max-number-of-k-sum-pairs
2054-the-number-of-the-smallest-unoccupied-chair
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2552-maximum-sum-of-distinct-subarrays-with-length-k
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2599-take-k-of-each-character-from-left-and-right
2677-cousins-in-binary-tree-ii
2755-extra-characters-in-a-string
3276-minimum-number-of-pushes-to-type-word-ii
3329-find-the-length-of-the-longest-common-prefix
3501-delete-nodes-from-linked-list-present-in-array

Counting


0169-majority-element
0920-uncommon-words-from-two-sentences
1620-check-if-array-pairs-are-divisible-by-k
1786-count-the-number-of-consistent-strings
2163-kth-distinct-string-in-an-array
2356-largest-combination-with-bitwise-and-greater-than-zero
2494-sum-of-prefix-scores-of-strings
3276-minimum-number-of-pushes-to-type-word-ii

Breadth-First Search


0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0117-populating-next-right-pointers-in-each-node-ii
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0279-perfect-squares
0399-evaluate-division
0433-minimum-genetic-mutation
0787-sliding-puzzle
0945-snakes-and-ladders
0999-regions-cut-by-slashes
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2171-second-minimum-time-to-reach-destination
2375-minimum-obstacle-removal-to-reach-corner
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
2711-minimum-time-to-visit-a-cell-in-a-grid
3517-shortest-distance-after-road-addition-queries-i

Design


0146-lru-cache
0155-min-stack
0173-binary-search-tree-iterator
0380-insert-delete-getrandom-o1
0432-all-oone-data-structure
0729-my-calendar-i
0731-my-calendar-ii
0789-kth-largest-element-in-a-stream
0859-design-circular-deque
1497-design-a-stack-with-increment-operation

Dynamic Programming


0005-longest-palindromic-substring
0022-generate-parentheses
0045-jump-game-ii
0055-jump-game
0072-edit-distance
0097-interleaving-string
0118-pascals-triangle
0122-best-time-to-buy-and-sell-stock-ii
0139-word-break
0152-maximum-product-subarray
0198-house-robber
0221-maximal-square
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0279-perfect-squares
0650-2-keys-keyboard
0664-strange-printer
0954-maximum-sum-circular-subarray
1196-filling-bookcase-shelves
1240-stone-game-ii
1402-count-square-submatrices-with-all-ones
1511-count-number-of-teams
1756-minimum-deletions-to-make-string-balanced
1766-minimum-number-of-removals-to-make-mountain-array
2067-maximum-number-of-points-with-cost
2554-minimum-total-distance-traveled
2586-longest-square-streak-in-an-array
2755-extra-characters-in-a-string
2794-maximum-number-of-moves-in-a-grid

Binary Indexed Tree


1511-count-number-of-teams

Binary Search


0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0074-search-a-2d-matrix
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0209-minimum-size-subarray-sum
0222-count-complete-tree-nodes
0719-find-k-th-smallest-pair-distance
0729-my-calendar-i
0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
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
2006-find-the-student-that-will-replace-the-chalk
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2586-longest-square-streak-in-an-array
2699-count-the-number-of-fair-pairs
2716-prime-subtraction-operation

Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0437-path-sum-iii
0543-diameter-of-binary-tree
0772-construct-quad-tree
0776-n-ary-tree-postorder-traversal
0789-kth-largest-element-in-a-stream
0904-leaf-similar-trees
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Binary Tree


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0222-count-complete-tree-nodes
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0437-path-sum-iii
0543-diameter-of-binary-tree
0789-kth-largest-element-in-a-stream
0904-leaf-similar-trees
0988-flip-equivalent-binary-trees
1484-linked-list-in-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Math


0012-integer-to-roman
0048-rotate-image
0050-powx-n
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0189-rotate-array
0224-basic-calculator
0241-different-ways-to-add-parentheses
0264-ugly-number-ii
0273-integer-to-english-words
0279-perfect-squares
0380-insert-delete-getrandom-o1
0539-minimum-time-difference
0564-find-the-closest-palindrome
0592-fraction-addition-and-subtraction
0650-2-keys-keyboard
0670-maximum-swap
0870-magic-squares-in-grid
1146-greatest-common-divisor-of-strings
1240-stone-game-ii
2155-find-missing-observations
2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Recursion


0050-powx-n
0206-reverse-linked-list
0224-basic-calculator
0241-different-ways-to-add-parentheses
0273-integer-to-english-words
0394-decode-string
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string

Depth-First Search


0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii
0129-sum-root-to-leaf-numbers
0130-surrounded-regions
0133-clone-graph
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree
0399-evaluate-division
0437-path-sum-iii
0543-diameter-of-binary-tree
0776-n-ary-tree-postorder-traversal
0904-leaf-similar-trees
0984-most-stones-removed-with-same-row-or-column
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1350-remove-sub-folders-from-the-filesystem
1484-linked-list-in-binary-tree
1691-minimum-number-of-days-to-disconnect-island
2035-count-sub-islands
2545-height-of-binary-tree-after-subtree-removal-queries
2677-cousins-in-binary-tree-ii

Topological Sort


0207-course-schedule
0210-course-schedule-ii

Union Find


0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division
0984-most-stones-removed-with-same-row-or-column
0999-regions-cut-by-slashes
2035-count-sub-islands

Matrix


0036-valid-sudoku
0048-rotate-image
0054-spiral-matrix
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
0212-word-search-ii
0221-maximal-square
0289-game-of-life
0772-construct-quad-tree
0787-sliding-puzzle
0870-magic-squares-in-grid
0921-spiral-matrix-iii
0945-snakes-and-ladders
0999-regions-cut-by-slashes
1147-flip-columns-for-maximum-number-of-equal-rows
1402-count-square-submatrices-with-all-ones
1691-minimum-number-of-days-to-disconnect-island
1972-rotating-the-box
2035-count-sub-islands
2089-maximum-matrix-sum
2132-convert-1d-array-into-2d-array
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2411-spiral-matrix-iv
2711-minimum-time-to-visit-a-cell-in-a-grid
2794-maximum-number-of-moves-in-a-grid

Greedy


0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0134-gas-station
0179-largest-number
0452-minimum-number-of-arrows-to-burst-balloons
0502-ipo
0624-maximum-distance-in-arrays
0632-smallest-range-covering-elements-from-k-lists
0670-maximum-swap
0890-lemonade-change
0957-minimum-add-to-make-parentheses-valid
1304-longest-happy-string
1766-minimum-number-of-removals-to-make-mountain-array
2089-maximum-matrix-sum
2095-minimum-number-of-swaps-to-make-the-string-balanced
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2716-prime-subtraction-operation
3195-separate-black-and-white-balls
3276-minimum-number-of-pushes-to-type-word-ii

Sliding Window


0003-longest-substring-without-repeating-characters
0030-substring-with-concatenation-of-all-words
0076-minimum-window-substring
0209-minimum-size-subarray-sum
0567-permutation-in-string
0632-smallest-range-covering-elements-from-k-lists
0892-shortest-subarray-with-sum-at-least-k
1755-defuse-the-bomb
2255-minimum-swaps-to-group-all-1s-together-ii
2552-maximum-sum-of-distinct-subarrays-with-length-k
2599-take-k-of-each-character-from-left-and-right
3380-shortest-subarray-with-or-at-least-k-ii

Simulation


0054-spiral-matrix
0068-text-justification
0289-game-of-life
0592-fraction-addition-and-subtraction
0735-asteroid-collision
0906-walking-robot-simulation
0921-spiral-matrix-iii
1667-find-kth-bit-in-nth-binary-string
2006-find-the-student-that-will-replace-the-chalk
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2155-find-missing-observations
2343-count-unguarded-cells-in-the-grid
2411-spiral-matrix-iv
2470-removing-stars-from-a-string
2800-minimum-string-length-after-removing-substrings

Binary Search Tree


0098-validate-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0173-binary-search-tree-iterator
0230-kth-smallest-element-in-a-bst
0789-kth-largest-element-in-a-stream

Randomized


0380-insert-delete-getrandom-o1

Prefix Sum


0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0731-my-calendar-ii
0892-shortest-subarray-with-sum-at-least-k
1240-stone-game-ii
1435-xor-queries-of-a-subarray
1473-find-the-longest-substring-containing-vowels-in-even-counts
1694-make-sum-divisible-by-p
1833-find-the-highest-altitude
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2488-divide-intervals-into-minimum-number-of-groups

Doubly-Linked List


0146-lru-cache
0432-all-oone-data-structure

Strongly Connected Component


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

Heap (Priority Queue)


0264-ugly-number-ii
0373-find-k-pairs-with-smallest-sums
0502-ipo
0632-smallest-range-covering-elements-from-k-lists
0789-kth-largest-element-in-a-stream
0892-shortest-subarray-with-sum-at-least-k
1304-longest-happy-string
1325-path-with-maximum-probability
2054-the-number-of-the-smallest-unoccupied-chair
2375-minimum-obstacle-removal-to-reach-corner
2488-divide-intervals-into-minimum-number-of-groups
2616-maximal-score-after-applying-k-operations
2711-minimum-time-to-visit-a-cell-in-a-grid
2803-modify-graph-edge-weights

Data Stream


0789-kth-largest-element-in-a-stream

Iterator


0173-binary-search-tree-iterator

Backtracking


0022-generate-parentheses
0040-combination-sum-ii
0046-permutations
0079-word-search
0212-word-search-ii
1715-split-a-string-into-the-max-number-of-unique-substrings
2170-count-number-of-maximum-bitwise-or-subsets

Merge Sort


0148-sort-list

Queue


0859-design-circular-deque
0892-shortest-subarray-with-sum-at-least-k
0954-maximum-sum-circular-subarray

Monotonic Queue


0892-shortest-subarray-with-sum-at-least-k
0954-maximum-sum-circular-subarray

Trie


0139-word-break
0212-word-search-ii
0440-k-th-smallest-in-lexicographical-order
1350-remove-sub-folders-from-the-filesystem
2494-sum-of-prefix-scores-of-strings
2755-extra-characters-in-a-string
3329-find-the-length-of-the-longest-common-prefix

Memoization


0139-word-break
0241-different-ways-to-add-parentheses

Geometry


0149-max-points-on-a-line

Monotonic Stack


0084-largest-rectangle-in-histogram
1002-maximum-width-ramp
1679-shortest-subarray-to-be-removed-to-make-array-sorted

Game Theory


1240-stone-game-ii

Number Theory


2716-prime-subtraction-operation
2903-insert-greatest-common-divisors-in-linked-list

Brainteaser


2503-longest-subarray-with-maximum-bitwise-and

Rolling Hash


0214-shortest-palindrome

String Matching


0214-shortest-palindrome
0812-rotate-string

Hash Function


0214-shortest-palindrome

Segment Tree


0729-my-calendar-i
0731-my-calendar-ii

Ordered Set


0729-my-calendar-i
0731-my-calendar-ii

Enumeration


2170-count-number-of-maximum-bitwise-or-subsets

Name		Name	Last commit message	Last commit date
Latest commit History 929 Commits
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
0011-container-with-most-water		0011-container-with-most-water
0012-integer-to-roman		0012-integer-to-roman
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0022-generate-parentheses		0022-generate-parentheses
0030-substring-with-concatenation-of-all-words		0030-substring-with-concatenation-of-all-words
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
0035-search-insert-position		0035-search-insert-position
0036-valid-sudoku		0036-valid-sudoku
0040-combination-sum-ii		0040-combination-sum-ii
0045-jump-game-ii		0045-jump-game-ii
0046-permutations		0046-permutations
0048-rotate-image		0048-rotate-image
0050-powx-n		0050-powx-n
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0057-insert-interval		0057-insert-interval
0061-rotate-list		0061-rotate-list
0068-text-justification		0068-text-justification
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
0076-minimum-window-substring		0076-minimum-window-substring
0079-word-search		0079-word-search
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii		0082-remove-duplicates-from-sorted-list-ii
0084-largest-rectangle-in-histogram		0084-largest-rectangle-in-histogram
0086-partition-list		0086-partition-list
0088-merge-sorted-array		0088-merge-sorted-array
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0097-interleaving-string		0097-interleaving-string
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0101-symmetric-tree		0101-symmetric-tree
0102-binary-tree-level-order-traversal		0102-binary-tree-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
0106-construct-binary-tree-from-inorder-and-postorder-traversal		0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree		0108-convert-sorted-array-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list		0114-flatten-binary-tree-to-linked-list
0117-populating-next-right-pointers-in-each-node-ii		0117-populating-next-right-pointers-in-each-node-ii
0118-pascals-triangle		0118-pascals-triangle
0122-best-time-to-buy-and-sell-stock-ii		0122-best-time-to-buy-and-sell-stock-ii
0127-word-ladder		0127-word-ladder
0129-sum-root-to-leaf-numbers		0129-sum-root-to-leaf-numbers
0130-surrounded-regions		0130-surrounded-regions
0133-clone-graph		0133-clone-graph
0134-gas-station		0134-gas-station
0138-copy-list-with-random-pointer		0138-copy-list-with-random-pointer
0139-word-break		0139-word-break
0145-binary-tree-postorder-traversal		0145-binary-tree-postorder-traversal
0146-lru-cache		0146-lru-cache
0148-sort-list		0148-sort-list
0149-max-points-on-a-line		0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation		0150-evaluate-reverse-polish-notation
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
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
0160-intersection-of-two-linked-lists		0160-intersection-of-two-linked-lists
0162-find-peak-element		0162-find-peak-element
0169-majority-element		0169-majority-element
0173-binary-search-tree-iterator		0173-binary-search-tree-iterator
0179-largest-number		0179-largest-number
0189-rotate-array		0189-rotate-array
0190-reverse-bits		0190-reverse-bits
0191-number-of-1-bits		0191-number-of-1-bits
0198-house-robber		0198-house-robber
0199-binary-tree-right-side-view		0199-binary-tree-right-side-view
0200-number-of-islands		0200-number-of-islands
0201-bitwise-and-of-numbers-range		0201-bitwise-and-of-numbers-range
0206-reverse-linked-list		0206-reverse-linked-list
0207-course-schedule		0207-course-schedule
0209-minimum-size-subarray-sum		0209-minimum-size-subarray-sum
0210-course-schedule-ii		0210-course-schedule-ii
0212-word-search-ii		0212-word-search-ii
0214-shortest-palindrome		0214-shortest-palindrome
0221-maximal-square		0221-maximal-square
0222-count-complete-tree-nodes		0222-count-complete-tree-nodes
0224-basic-calculator		0224-basic-calculator
0230-kth-smallest-element-in-a-bst		0230-kth-smallest-element-in-a-bst
0236-lowest-common-ancestor-of-a-binary-tree		0236-lowest-common-ancestor-of-a-binary-tree
0238-product-of-array-except-self		0238-product-of-array-except-self
0241-different-ways-to-add-parentheses		0241-different-ways-to-add-parentheses
0264-ugly-number-ii		0264-ugly-number-ii
0273-integer-to-english-words		0273-integer-to-english-words
0279-perfect-squares		0279-perfect-squares
0283-move-zeroes		0283-move-zeroes
0289-game-of-life		0289-game-of-life
0328-odd-even-linked-list		0328-odd-even-linked-list
0373-find-k-pairs-with-smallest-sums		0373-find-k-pairs-with-smallest-sums
0380-insert-delete-getrandom-o1		0380-insert-delete-getrandom-o1
0394-decode-string		0394-decode-string

Ak-github-dev/LeetCode

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LeetCode

LeetCode Topics

Divide and Conquer

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Array

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Stack

Linked List

Two Pointers

Sorting

Hash Table

Counting

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Design

Dynamic Programming

Binary Indexed Tree

Binary Search

Tree

Binary Tree

Math

Recursion

Depth-First Search

Topological Sort

Union Find

Matrix

Greedy

Sliding Window

Simulation

Binary Search Tree

Randomized

Prefix Sum

Doubly-Linked List

Strongly Connected Component

Heap (Priority Queue)

Data Stream

Iterator

Backtracking

Merge Sort

Queue

Monotonic Queue

Trie

Memoization

Geometry

Monotonic Stack

Game Theory

Number Theory

Brainteaser

Rolling Hash

String Matching

Hash Function

Segment Tree

Ordered Set

Enumeration

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