| 1 |
Two Sum |
Solution |
Easy |
| 2 |
Add Two Numbers |
Solution |
Medium |
| 3 |
Longest Substring Without Repeating Characters |
Solution |
Medium |
| 4 |
Median of Two Sorted Arrays |
Solution |
Hard |
| 5 |
Longest Palindromic Substring |
Solution |
Medium |
| 6 |
Zigzag Conversion |
Solution |
Medium |
| 7 |
Reverse Integer |
Solution |
Medium |
| 9 |
Palindrome Number |
Solution |
Easy |
| 11 |
Container With Most Water |
Solution |
Medium |
| 12 |
Integer to Roman |
Solution |
Medium |
| 13 |
Roman to Integer |
Solution |
Easy |
| 14 |
Longest Common Prefix |
Solution |
Easy |
| 15 |
3Sum |
Solution |
Medium |
| 16 |
3Sum Closest |
Solution |
Medium |
| 17 |
Letter Combinations of a Phone Number |
Solution |
Medium |
| 19 |
Remove Nth Node From End of List |
Solution |
Medium |
| 22 |
Generate Parentheses |
Solution |
Medium |
| 25 |
Reverse Nodes in k-Group |
Solution |
Hard |
| 27 |
Remove Element |
Solution |
Easy |
| 42 |
Trapping Rain Water |
Solution |
Hard |
| 45 |
Jump Game II |
Solution |
Medium |
| 46 |
Permutations |
Solution |
Medium |
| 48 |
Rotate Image |
Solution |
Medium |
| 51 |
N-Queens |
Solution |
Hard |
| 53 |
Maximum Subarray |
Solution |
Medium |
| 55 |
Jump Game |
Solution |
Medium |
| 58 |
Length of Last Word |
Solution |
Easy |
| 61 |
Rotate List |
Solution |
Medium |
| 62 |
Unique Paths |
Solution |
Medium |
| 63 |
Unique Paths II |
Solution |
Medium |
| 64 |
Minimum Path Sum |
Solution |
Medium |
| 72 |
Edit Distance |
Solution |
Medium |
| 80 |
Remove Duplicates from Sorted Array II |
Solution |
Medium |
| 83 |
Remove Duplicates from Sorted List |
Solution |
Easy |
| 86 |
Partition List |
Solution |
Medium |
| 95 |
Unique Binary Search Trees II |
Solution |
Medium |
| 98 |
Validate Binary Search Tree |
Solution |
Medium |
| 101 |
Symmetric Tree |
Solution |
Easy |
| 103 |
Binary Tree Zigzag Level Order Traversal |
Solution |
Medium |
| 104 |
Maximum Depth of Binary Tree |
Solution |
Easy |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Solution |
Medium |
| 107 |
Binary Tree Level Order Traversal II |
Solution |
Medium |
| 112 |
Path Sum |
Solution |
Easy |
| 114 |
Flatten Binary Tree to Linked List |
Solution |
Medium |
| 116 |
Populating Next Right Pointers in Each Node |
Solution |
Medium |
| 118 |
Pascal's Triangle |
Solution |
Easy |
| 120 |
Triangle |
Solution |
Medium |
| 121 |
Best Time to Buy and Sell Stock |
Solution |
Easy |
| 125 |
Valid Palindrome |
Solution |
Easy |
| 139 |
Word Break |
Solution |
Medium |
| 144 |
Binary Tree Preorder Traversal |
Solution |
Easy |
| 146 |
LRU Cache |
Solution |
Medium |
| 151 |
Reverse Words in a String |
Solution |
Medium |
| 165 |
Compare Version Numbers |
Solution |
Medium |
| 167 |
Two Sum II - Input Array Is Sorted |
Solution |
Medium |
| 189 |
Rotate Array |
Solution |
Medium |
| 198 |
House Robber |
Solution |
Medium |
| 199 |
Binary Tree Right Side View |
Solution |
Medium |
| 202 |
Happy Number |
Solution |
Easy |
| 205 |
Isomorphic Strings |
Solution |
Easy |
| 206 |
Reverse Linked List |
Solution |
Easy |
| 221 |
Maximal Square |
Solution |
Medium |
| 222 |
Count Complete Tree Nodes |
Solution |
Medium |
| 226 |
Invert Binary Tree |
Solution |
Easy |
| 230 |
Kth Smallest Element in a BST |
Solution |
Medium |
| 236 |
Lowest Common Ancestor of a Binary Tree |
Solution |
Medium |
| 238 |
Product of Array Except Self |
Solution |
Medium |
| 290 |
Word Pattern |
Solution |
Easy |
| 300 |
Longest Increasing Subsequence |
Solution |
Medium |
| 303 |
Range Sum Query - Immutable |
Solution |
Easy |
| 322 |
Coin Change |
Solution |
Medium |
| 334 |
Increasing Triplet Subsequence |
Solution |
Medium |
| 345 |
Reverse Vowels of a String |
Solution |
Easy |
| 374 |
Guess Number Higher or Lower |
Solution |
Easy |
| 392 |
Is Subsequence |
Solution |
Easy |
| 437 |
Path Sum III |
Solution |
Medium |
| 443 |
String Compression |
Solution |
Medium |
| 523 |
Continuous Subarray Sum |
Solution |
Medium |
| 530 |
Minimum Absolute Difference in BST |
Solution |
Easy |
| 563 |
Binary Tree Tilt |
Solution |
Easy |
| 623 |
Add One Row to Tree |
Solution |
Medium |
| 637 |
Average of Levels in Binary Tree |
Solution |
Easy |
| 643 |
Maximum Average Subarray I |
Solution |
Easy |
| 653 |
Two Sum IV - Input is a BST |
Solution |
Easy |
| 654 |
Maximum Binary Tree |
Solution |
Medium |
| 655 |
Print Binary Tree |
Solution |
Medium |
| 680 |
Valid Palindrome II |
Solution |
Easy |
| 747 |
Min Cost Climbing Stairs |
Solution |
Easy |
| 904 |
Leaf-Similar Trees |
Solution |
Easy |
| 967 |
Minimum Falling Path Sum |
Solution |
Medium |
| 1046 |
Max Consecutive Ones III |
Solution |
Medium |
| 1146 |
Greatest Common Divisor of Strings |
Solution |
Easy |
| 1236 |
N-th Tribonacci Number |
Solution |
Easy |
| 1392 |
Find the Difference of Two Arrays |
Solution |
Easy |
| 1474 |
Longest ZigZag Path in a Binary Tree |
Solution |
Medium |
| 1544 |
Count Good Nodes in Binary Tree |
Solution |
Medium |
| 1567 |
Maximum Number of Vowels in a Substring of Given Length |
Solution |
Medium |
| 1693 |
Sum of All Odd Length Subarrays |
Solution |
Easy |
| 1798 |
Max Number of K-Sum Pairs |
Solution |
Medium |
| 1894 |
Merge Strings Alternately |
Solution |
Easy |
| 2265 |
Partition Array According to Given Pivot |
Solution |
Medium |
| 2728 |
Sum in a Matrix |
Solution |
Medium |