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Leetcode

LeetCode Algorithms

# Title Solution Difficulty
1 TwoSum Java easy
2 Add Two Numbers Java medium
3 Longest Substring Without Repeating Characters Java medium
4 Median of Two Sorted Arrays Java hard
5 Longest Palindromic Substring Java medium
7 Reverse Integer Java medium
8 String to Integer (atoi) Java medium
10 Regular Expression Matching Java hard
11 Container With Most Water Java medium
12 Integer to Roman Java medium
13 Roman to Integer Java easy
14 Longest Common Prefix Java easy
19 Remove Nth Node From End of List Java medium
20 Valid Parentheses Java easy
21 Merge Two Sorted Lists Java easy
22 Generate Parentheses Java medium
26 Remove Duplicates from Sorted Array Java easy
28 Find the Index of the First Occurrence in a String Java medium
36 Valid Sudoku Java medium
53 Maximum Subarray Java medium
58 Length of Last Word Java easy
66 Plus One Java easy
69 Sqrt(x) Java easy
70 Climbing Stairs Java easy
88 Merge Sorted Array Java easy
98 Validate Binary Search Tree Java medium
99 Recover Binary Search Tree Java medium
100 Same Tree Java easy
101 Symmetric Tree Java easy
102 Binary Tree Level Order Traversal Java medium
103 Binary Tree Zigzag Level Order Traversal Java medium
104 Maximum Depth of Binary Tree Java easy
107 Binary Tree Level Order Traversal II Java medium
108 Convert Sorted Array to Binary Search Tree Java easy
110 Balanced Binary Tree Java easy
111 Minimum Depth of Binary Tree Java easy
112 Path Sum Java easy
116 Populating Next Right Pointers in Each Node Java medium
117 Populating Next Right Pointers in Each Node II Java medium
118 Pascal's Triangle Java easy
121 Best Time to Buy and Sell Stock Java easy
122 Best Time to Buy and Sell Stock II Java medium
125 Valid Palindrome Java easy
133 Clone Graph Java medium
136 Single Number Java easy
141 Linked List Cycle I Java easy
142 Linked List Cycle II Java medium
155 Min Stack Java medium
169 Majority Element Java easy
189 Rotate Array Java medium
191 Number of 1 Bits Java easy
198 House Robber Java medium
202 Happy Number Java easy
204 Count Primes Java medium
205 Isomorphic Strings Java easy
206 Reverse Linked List Java easy
207 Course Schedule Java medium
208 Implement Trie (Prefix Tree) Java medium
217 Contains Duplicate Java easy
234 Palindrome Linked List Java easy
237 Delete Node in a Linked List Java medium
242 Valid Anagram Java easy
268 Missing Number Java easy
278 First Bad Version Java easy
283 Move Zeroes Java easy
319 Bulb Switcher Java medium
326 Power of Three Java easy
344 Reverse String Java easy
350 Intersection of Two Arrays II Java easy
384 Shuffle an Array Java medium
387 First Unique Character in a String Java easy
392 Is Subsequence Java easy
409 Longest Palindrome Java easy
412 Fizz Buzz Java easy
424 Longest Repeating Character Replacement Java medium
438 Find All Anagrams in a String Java medium
461 Hamming Distance Java easy
509 Fibonacci Number Java easy
551 Student Attendance Record I Java easy
589 N-ary Tree Preorder Traversal Java easy
695 Max Area of Island Java medium
704 Binary Search Java easy
705 Design HashSet Java easy
706 Design HashMap Java easy
724 Find Pivot Index Java easy
746 Min Cost Climbing Stairs Java easy
844 Backspace String Compare Java easy
876 Middle of the Linked List Java easy
1046 Last Stone Weight Java easy
1480 Running Sum of 1d Array Java easy
1839 Longest Substring Of All Vowels in Order Java medium
1943 Describe the Painting Java medium
2160 Minimum Sum Of Four Digit Number After Splitting Digits Java easy

LeetCode Database

# Title Solution Difficulty
173 Rank Scores MySQL medium
175 Combine Two Tables MySQL easy
176 Second Highest Salary MySQL medium
183 Customers Who Never Order MySQL easy
185 Department Top Three Salaries MySQL hard
196 Delete Duplicate Emails MySQL easy
197 Rising Temperature MySQL easy
584 Find Customer Referee MySQL easy
589 Customer Placing the Largest of Orders MySQL easy
595 Big Countries MySQL easy
607 Sales Person MySQL easy
608 Tree Node MySQL medium
627 Swap Salary MySQL easy
1141 User Activity for the Past 30 Days I MySQL easy
1148 Article Views I MySQL easy
1484 Group Sold Products By The Date MySql easy
1527 Patients With a Condition MySql easy
1581 Customer Who Visited but Did Not Make Any Transactions MySql easy
1667 Fix Names In A Table MySQL easy
1693 Daily Leads and Partners MySQL easy
1729 Find Followers Count MySQL easy
1757 Recyclable and Low Fat Products MySQL easy
1795 Rearrange Products Table MySQL easy
1873 Calculate Special Bonus MySQL easy
1965 Employees With Missing Information MySQL easy

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