| 1 |
Two Sum |
C |
Easy |
| 2 |
Add Two Numbers |
C |
Medium |
| 3 |
Longest Substring Without Repeating Characters |
C |
Medium |
| 4 |
Median of Two Sorted Arrays |
C |
Hard |
| 6 |
Zigzag Conversion |
C |
Medium |
| 7 |
Reverse Integer |
C |
Medium |
| 8 |
String to Integer (atoi) |
C |
Medium |
| 9 |
Palindrome Number |
C |
Easy |
| 10 |
Regular Expression Matching |
C |
Hard |
| 11 |
Container With Most Water |
C |
Medium |
| 12 |
Integer to Roman |
C |
Medium |
| 13 |
Roman to Integer |
C |
Easy |
| 14 |
Longest Common Prefix |
C |
Easy |
| 20 |
Valid Parentheses |
C |
Easy |
| 21 |
Merge Two Sorted Lists |
C |
Easy |
| 24 |
Swap Nodes in Pairs |
C |
Medium |
| 26 |
Remove Duplicates from Sorted Array |
C |
Easy |
| 27 |
Remove Element |
C |
Easy |
| 28 |
Find the Index of the First Occurrence in a String |
C |
Medium |
| 29 |
Divide Two Integers |
C |
Medium |
| 32 |
Longest Valid Parentheses |
C |
Hard |
| 35 |
Search Insert Position |
C |
Easy |
| 37 |
Sudoku Solver |
C |
Hard |
| 38 |
Count and Say |
C |
Medium |
| 42 |
Trapping Rain Water |
C |
Hard |
| 50 |
Pow(x, n) |
C |
Medium |
| 53 |
Maximum Subarray |
C |
Medium |
| 62 |
Unique Paths |
C |
Medium |
| 63 |
Unique Paths II |
C |
Medium |
| 66 |
Plus One |
C |
Easy |
| 75 |
Sort Colors |
C |
Medium |
| 79 |
Word Search |
C |
Medium |
| 82 |
Remove Duplicates from Sorted List II |
C |
Medium |
| 83 |
Remove Duplicates from Sorted List |
C |
Easy |
| 94 |
Binary Tree Inorder Traversal |
C |
Easy |
| 98 |
Validate Binary Search Tree |
C |
Medium |
| 101 |
Symmetric Tree |
C |
Easy |
| 104 |
Maximum Depth of Binary Tree |
C |
Easy |
| 108 |
Convert Sorted Array to Binary Search Tree |
C |
Easy |
| 109 |
Convert Sorted List to Binary Search Tree |
C |
Medium |
| 110 |
Balanced Binary Tree |
C |
Easy |
| 112 |
Path Sum |
C |
Easy |
| 118 |
Pascal's Triangle |
C |
Easy |
| 119 |
Pascal's Triangle II |
C |
Easy |
| 121 |
Best Time to Buy and Sell Stock |
C |
Easy |
| 124 |
Binary Tree Maximum Path Sum |
C |
Hard |
| 125 |
Valid Palindrome |
C |
Easy |
| 136 |
Single Number |
C |
Easy |
| 141 |
Linked List Cycle |
C |
Easy |
| 142 |
Linked List Cycle II |
C |
Medium |
| 153 |
Find Minimum in Rotated Sorted Array |
C |
Medium |
| 160 |
Intersection of Two Linked Lists |
C |
Easy |
| 169 |
Majority Element |
C |
Easy |
| 173 |
Binary Search Tree Iterator |
C |
Medium |
| 189 |
Rotate Array |
C |
Medium |
| 190 |
Reverse Bits |
C |
Easy |
| 191 |
Number of 1 Bits |
C |
Easy |
| 201 |
Bitwise AND of Numbers Range |
C |
Medium |
| 203 |
Remove Linked List Elements |
C |
Easy |
| 206 |
Reverse Linked List |
C |
Easy |
| 215 |
Kth Largest Element in an Array |
C |
Medium |
| 217 |
Contains Duplicate |
C |
Easy |
| 223 |
Rectangle Area |
C |
Medium |
| 226 |
Invert Binary Tree |
C |
Easy |
| 230 |
Kth Smallest Element in a BST |
C |
Medium |
| 231 |
Power of Two |
C |
Easy |
| 234 |
Palindrome Linked List |
C |
Easy |
| 236 |
Lowest Common Ancestor of a Binary Tree |
C |
Medium |
| 242 |
Valid Anagram |
C |
Easy |
| 268 |
Missing Number |
C |
Easy |
| 274 |
H-Index |
C |
Medium |
| 278 |
First Bad Version |
C |
Easy |
| 283 |
Move Zeroes |
C |
Easy |
| 287 |
Find the Duplicate Number |
C |
Medium |
| 344 |
Reverse String |
C |
Easy |
| 367 |
Valid Perfect Square |
C |
Easy |
| 387 |
First Unique Character in a String |
C |
Easy |
| 389 |
Find the Difference |
C |
Easy |
| 404 |
Sum of Left Leaves |
C |
Easy |
| 442 |
Find All Duplicates in an Array |
C |
Medium |
| 461 |
Hamming Distance |
C |
Easy |
| 476 |
Number Complement |
C |
Easy |
| 485 |
Max Consecutive Ones |
C |
Easy |
| 509 |
Fibonacci Number |
C |
Easy |
| 520 |
Detect Capital |
C |
Easy |
| 561 |
Array Partition |
C |
Easy |
| 567 |
Permutation in String |
C |
Medium |
| 617 |
Merge Two Binary Trees |
C |
Easy |
| 647 |
Palindromic Substrings |
C |
Medium |
| 669 |
Trim a Binary Search Tree |
C |
Medium |
| 674 |
Longest Continuous Increasing Subsequence |
C |
Easy |
| 684 |
Redundant Connection |
C |
Medium |
| 700 |
Search in a Binary Search Tree |
C |
Easy |
| 701 |
Insert into a Binary Search Tree |
C |
Medium |
| 704 |
Binary Search |
C |
Easy |
| 709 |
To Lower Case |
C |
Easy |
| 771 |
Jewels and Stones |
C |
Easy |
| 807 |
Max Increase to Keep City Skyline |
C |
Medium |
| 841 |
Keys and Rooms |
C |
Medium |
| 852 |
Peak Index in a Mountain Array |
C |
Medium |
| 876 |
Middle of the Linked List |
C |
Easy |
| 901 |
Online Stock Span |
C |
Medium |
| 905 |
Sort Array By Parity |
C |
Easy |
| 917 |
Reverse Only Letters |
C |
Easy |
| 931 |
Minimum Falling Path Sum |
C |
Medium |
| 938 |
Range Sum of BST |
C |
Easy |
| 953 |
Verifying an Alien Dictionary |
C |
Easy |
| 965 |
Univalued Binary Tree |
C |
Easy |
| 977 |
Squares of a Sorted Array |
C |
Easy |
| 979 |
Distribute Coins in Binary Tree |
C |
Medium |
| 985 |
Sum of Even Numbers After Queries |
C |
Medium |
| 997 |
Find the Town Judge |
C |
Easy |
| 1008 |
Construct Binary Search Tree from Preorder Traversal |
C |
Medium |
| 1009 |
Complement of Base 10 Integer |
C |
Easy |
| 1019 |
Next Greater Node In Linked List |
C |
Medium |
| 1026 |
Maximum Difference Between Node and Ancestor |
C |
Medium |
| 1089 |
Duplicate Zeros |
C |
Easy |
| 1137 |
N-th Tribonacci Number |
C |
Easy |
| 1147 |
Longest Chunked Palindrome Decomposition |
C |
Hard |
| 1184 |
Distance Between Bus Stops |
C |
Easy |
| 1189 |
Maximum Number of Balloons |
C |
Easy |
| 1207 |
Unique Number of Occurrences |
C |
Easy |
| 1283 |
Find the Smallest Divisor Given a Threshold |
C |
Medium |
| 1524 |
Number of Sub-arrays With Odd Sum |
C |
Medium |
| 1653 |
Minimum Deletions to Make String Balanced |
C |
Medium |
| 1657 |
Determine if Two Strings Are Close |
C |
Medium |
| 1695 |
Maximum Erasure Value |
C |
Medium |
| 1704 |
Determine if String Halves Are Alike |
C |
Easy |
| 1752 |
Check if Array Is Sorted and Rotated |
C |
Easy |
| 1769 |
Minimum Number of Operations to Move All Balls to Each Box |
C |
Medium |
| 1833 |
Maximum Ice Cream Bars |
C |
Medium |
| 1838 |
Frequency of the Most Frequent Element |
C |
Medium |
| 2024 |
Maximize the Confusion of an Exam |
C |
Medium |
| 2095 |
Delete the Middle Node of a Linked List |
C |
Medium |
| 2125 |
Number of Laser Beams in a Bank |
C |
Medium |
| 2130 |
Maximum Twin Sum of a Linked List |
C |
Medium |
| 2222 |
Number of Ways to Select Buildings |
C |
Medium |
| 2256 |
Minimum Average Difference |
C |
Medium |
| 2270 |
Number of Ways to Split Array |
C |
Medium |
| 2279 |
Maximum Bags With Full Capacity of Rocks |
C |
Medium |
| 2304 |
Minimum Path Cost in a Grid |
C |
Medium |
| 2482 |
Difference Between Ones and Zeros in Row and Column |
C |
Medium |
| 2501 |
Longest Square Streak in an Array |
C |
Medium |
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