| 1 |
Two Sum |
| 2 |
Add Two Numbers |
| 3 |
Longest Substring Without Repeating Characters |
| 7 |
Reverse Integer |
| 9 |
Palindrome Number |
| 11 |
Container With Most Water |
| 12 |
Integer to Roman |
| 13 |
Roman to Integer |
| 14 |
Longest Common Prefix |
| 20 |
Valid Parentheses |
| 21 |
Merge Two Sorted Lists |
| 24 |
Swap Nodes in Pairs |
| 26 |
Remove Duplicates from Sorted Array |
| 27 |
Remove Element |
| 28 |
Implement strStr() |
| 31 |
Next Permutation |
| 33 |
Search in Rotated Sorted Array |
| 35 |
Search Insert Position |
| 38 |
Count and Say |
| 41 |
First Missing Positive |
| 46 |
Permutations |
| 47 |
Permutations II |
| 49 |
Group Anagrams |
| 51 |
N-Queens |
| 52 |
N-Queens II |
| 53 |
Maximum Subarray |
| 54 |
Spiral Matrix |
| 55 |
Jump Game |
| 56 |
Merge Intervals |
| 58 |
Length of Last Word |
| 64 |
Minimum Path Sum |
| 66 |
Plus One |
| 67 |
Add Binary |
| 69 |
Sqrt(x) |
| 70 |
Climbing Stairs |
| 78 |
Subsets |
| 80 |
Remove Duplicates from Sorted Array II |
| 83 |
Remove Duplicates from Sorted List |
| 88 |
Merge Sorted Array |
| 89 |
Gray Code |
| 90 |
Subsets II |
| 94 |
Binary Tree Inorder Traversal |
| 100 |
Same Tree |
| 101 |
Symmetric Tree |
| 102 |
Binary Tree Level Order Traversal |
| 104 |
Maximum Depth of Binary Tree |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
| 107 |
Binary Tree Level Order Traversal II |
| 108 |
Convert Sorted Array to Binary Search Tree |
| 110 |
Balanced Binary Tree |
| 111 |
Minimum Depth of Binary Tree |
| 112 |
Path Sum |
| 116 |
Populating Next Right Pointers in Each Node |
| 118 |
Pascal's Triangle |
| 119 |
Pascal's Triangle II |
| 121 |
Best Time to Buy and Sell Stock |
| 122 |
Best Time to Buy and Sell Stock II |
| 124 |
Binary Tree Maximum Path Sum |
| 125 |
Valid Palindrome |
| 127 |
Word Ladder |
| 136 |
Single Number |
| 139 |
Word Break |
| 141 |
Linked List Cycle |
| 144 |
Binary Tree Preorder Traversal |
| 145 |
Binary Tree Postorder Traversal |
| 146 |
LRU Cache |
| 150 |
Evaluate Reverse Polish Notation |
| 155 |
Min Stack |
| 153 |
Find Minimum in Rotated Sorted Array |
| 160 |
Intersection of Two Linked Lists |
| 167 |
Two Sum II - Input array is sorted |
| 168 |
Excel Sheet Column Title |
| 169 |
Majority Element |
| 171 |
Excel Sheet Column Number |
| 172 |
Factorial Trailing Zeroes |
| 189 |
Rotate Array |
| 190 |
Reverse Bits |
| 191 |
Number of 1 Bits |
| 198 |
House Robber |
| 200 |
Number of Islands |
| 201 |
Bitwise AND of Numbers Range |
| 202 |
Happy Number |
| 203 |
Remove Linked List Elements |
| 204 |
Count Primes |
| 205 |
Isomorphic Strings |
| 206 |
Reverse Linked List |
| 208 |
Implement Trie (Prefix Tree) |
| 217 |
Contains Duplicate |
| 219 |
Contains Duplicate II |
| 221 |
Maximal Square |
| 222 |
Count Complete Tree Nodes |
| 225 |
Implement Stack using Queues |
| 226 |
Invert Binary Tree |
| 228 |
Summary Ranges |
| 230 |
Kth Smallest Element in a BST |
| 231 |
Power of Two |
| 232 |
Implement Queue using Stacks |
| 234 |
Palindrome Linked List |
| 235 |
Lowest Common Ancestor of a Binary Search Tree |
| 237 |
Delete Node in a Linked List |
| 238 |
Product of Array Except Self |
| 242 |
Valid Anagram |
| 257 |
Binary Tree Paths |
| 258 |
Add Digits |
| 263 |
Ugly Number |
| 268 |
Missing Number |
| 274 |
H-Index |
| 278 |
First Bad Version |
| 283 |
Move Zeroes |
| 290 |
Word Pattern |
| 292 |
Nim Game |
| 299 |
Bulls and Cows |
| 303 |
Range Sum Query - Immutable |
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
| 322 |
Coin Change |
| 326 |
Power of Three |
| 328 |
Odd Even Linked List |
| 338 |
Counting Bits |
| 342 |
Power of Four |
| 344 |
Reverse String |
| 345 |
Reverse Vowels of a String |
| 349 |
Intersection of Two Arrays |
| 350 |
Intersection of Two Arrays II |
| 354 |
Russian Doll Envelopes |
| 367 |
Valid Perfect Square |
| 374 |
Guess Number Higher or Lower |
| 376 |
Wiggle Subsequence |
| 383 |
Ransom Note |
| 387 |
First Unique Character in a String |
| 389 |
Find the Difference |
| 392 |
Is Subsequence |
| 394 |
Decode String |
| 402 |
Remove K Digits |
| 403 |
Frog Jump |
| 404 |
Sum of Left Leaves |
| 405 |
Convert a Number to Hexadecimal |
| 409 |
Longest Palindrome |
| 412 |
Fizz Buzz |
| 414 |
Third Maximum Number |
| 415 |
Add Strings |
| 416 |
Partition Equal Subset Sum |
| 417 |
Pacific Atlantic Water Flow |
| 423 |
Reconstruct Original Digits from English |
| 434 |
Number of Segments in a String |
| 438 |
Find All Anagrams in a String |
| 441 |
Arranging Coins |
| 448 |
Find All Numbers Disappeared in an Array |
| 451 |
Sort Characters By Frequency |
| 455 |
Assign Cookies |
| 459 |
Repeated Substring Pattern |
| 461 |
Hamming Distance |
| 463 |
Island Perimeter |
| 476 |
Number Complement |
| 478 |
Generate Random Point in a Circle |
| 482 |
License Key Formatting |
| 485 |
Max Consecutive Ones |
| 492 |
Construct the Rectangle |
| 495 |
Teemo Attacking |
| 498 |
Diagonal Traverse |
| 500 |
Keyboard Row |
| 504 |
Base 7 |
| 506 |
Relative Ranks |
| 507 |
Perfect Number |
| 509 |
Fibonacci Number |
| 520 |
Detect Capital |
| 525 |
Contiguous Array |
| 535 |
Encode and Decode TinyURL |
| 540 |
Single Element in a Sorted Array |
| 543 |
Diameter of Binary Tree |
| 560 |
Subarray Sum Equals K |
| 561 |
Array Partition |
| 567 |
Permutation in String |
| 575 |
Distribute Candies |
| 623 |
Add One Row to Tree |
| 637 |
Average of Levels in Binary Tree |
| 643 |
Maximum Average Subarray I |
| 645 |
Set Mismatch |
| 647 |
Palindromic Substrings |
| 678 |
Valid Parenthesis String |
| 680 |
Valid Palindrome II |
| 682 |
Baseball Game |
| 697 |
Degree of an Array |
| 700 |
Search in a Binary Search Tree |
| 706 |
Design HashMap |
| 709 |
To Lower Case |
| 714 |
Best Time to Buy and Sell Stock with Transaction Fee |
| 721 |
Accounts Merge |
| 724 |
Find Pivot Index |
| 728 |
Self Dividing Numbers |
| 733 |
Flood Fill |
| 747 |
Largest Number At Least Twice of Others |
| 771 |
Jewels and Stones |
| 775 |
Global and Local Inversions |
| 820 |
Short Encoding of Words |
| 823 |
Binary Trees With Factors |
| 836 |
Rectangle Overlap |
| 841 |
Keys and Rooms |
| 844 |
Backspace String Compare |
| 869 |
Reordered Power of 2 |
| 870 |
Advantage Shuffle |
| 876 |
Middle of the Linked List |
| 883 |
Projection Area of 3D Shapes |
| 884 |
Uncommon Words from Two Sentences |
| 886 |
Possible Bipartition |
| 901 |
Online Stock Span |
| 905 |
Sort Array By Parity |
| 912 |
Sort an Array |
| 916 |
Word Subsets |
| 918 |
Maximum Sum Circular Subarray |
| 923 |
3Sum With Multiplicity |
| 935 |
Knight Dialer |
| 938 |
Range Sum of BST |
| 941 |
Valid Mountain Array |
| 966 |
Vowel Spellchecker |
| 971 |
Flip Binary Tree To Match Preorder Traversal |
| 977 |
Squares of a Sorted Array |
| 979 |
Distribute Coins in Binary Tree |
| 984 |
String Without AAA or BBB |
| 993 |
Cousins in Binary Tree |
| 997 |
Find the Town Judge |
| 1008 |
Construct Binary Search Tree from Preorder Traversal |
| 1009 |
Complement of Base 10 Integer |
| 1046 |
Last Stone Weight |
| 1089 |
Duplicate Zeros |
| 1051 |
Height Checker |
| 1143 |
Longest Common Subsequence |
| 1207 |
Unique Number of Occurrences |
| 1232 |
Check If It Is a Straight Line |
| 1277 |
Count Square Submatrices with All Ones |
| 1295 |
Find Numbers with Even Number of Digits |
| 1332 |
Remove Palindromic Subsequences |
| 1386 |
Cinema Seat Allocation |
| 1394 |
Find Lucky Integer in an Array |
| 1396 |
Design Underground System |
| 1426 |
Counting Elements |
| 1427 |
Perform String Shifts |
| 1428 |
Leftmost Column with at Least a One |
| 1429 |
First Unique Number |
| 1430 |
Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree |
| 1461 |
Check If a String Contains All Binary Codes of Size K |
| 1572 |
Matrix Diagonal Sum |
| 1672 |
Richest Customer Wealth |
| 1721 |
Swapping Nodes in a Linked List |
| 1807 |
Evaluate the Bracket Pairs of a String |
| 1971 |
Find if Path Exists in Graph |
| 2215 |
Find the Difference of Two Arrays |
| 2225 |
Find Players With Zero or One Losses |