|
|
Easy |
c++ |
|
|
Medium |
c++ |
|
|
Hard |
c++ |
| 1 |
Two Sum |
Easy |
c++ |
| 2 |
Add Two Numbers |
Medium |
c++ |
| 3 |
Longest Substring Without Repeating Characters |
Medium |
c++ |
| 5 |
Longest Palindromic Substring |
Medium |
c++ |
| 8 |
String to Integer (atoi) |
Medium |
c++ |
| 9 |
Palindrome Number |
Easy |
c++ |
| 11 |
Container With Most Water |
Easy |
c++ |
| 14 |
Longest Common Prefix |
Easy |
c++ |
| 15 |
3Sum |
Medium |
c++ |
| 16 |
3Sum Closest |
Medium |
c++ |
| 19 |
Remove Nth Node From End of List |
Medium |
c++ |
| 20 |
Valid Parentheses |
Easy |
c++ |
| 21 |
Merge Two Sorted Lists |
Easy |
c++ |
| 22 |
Generate Parentheses |
Medium |
c++ |
| 24 |
Swap Nodes in Pairs |
Medium |
c++ |
| 26 |
Remove Duplicates from Sorted Array |
Easy |
c++ |
| 27 |
Remove Element |
Easy |
c++ |
| 28 |
Implement strStr() |
Easy |
c++ |
| 32 |
Longest Valid Parentheses |
Hard |
c++ |
| 33 |
Search in Rotated Sorted Array |
Medium |
c++ |
| 34 |
Find First and Last Position of Element in Sorted Array |
Medium |
c++ |
| 35 |
Search Insert Position |
Easy |
c++ |
| 36 |
Valid Sudoku |
Medium |
c++ |
| 41 |
First Missing Positive |
Hard |
c++ |
| 42 |
Trapping Rain Water |
Hard |
c++ |
| 44 |
Wildcard Matching |
Hard |
c++ |
| 46 |
Permutations |
Medium |
c++ |
| 48 |
Rotate Image |
Medium |
c++ |
| 49 |
Group Anagrams |
Medium |
c++ |
| 50 |
Pow(x, n) |
Medium |
c++ |
| 53 |
Maximum Subarray |
Easy |
c++ |
| 54 |
Spiral Matrix |
Medium |
c++ |
| 55 |
Jump Game |
Medium |
c++ |
| 56 |
Merge Intervals |
Medium |
c++ |
| 58 |
Length of Last Word |
Easy |
c++ |
| 61 |
Rotate List |
Medium |
c++ |
| 62 |
Unique Paths |
Medium |
c++ |
| 63 |
Unique Paths II |
Medium |
c++ |
| 66 |
Plus One |
Easy |
c++ |
| 67 |
Add Binary |
Easy |
c++ |
| 69 |
Sqrt(x) |
Easy |
c++ |
| 70 |
Climbing Stairs |
Easy |
c++ |
| 72 |
Edit Distance |
Hard |
c++ |
| 79 |
Word Search |
Medium |
c++ |
| 82 |
Remove Duplicates from Sorted List II |
Medium |
c++ |
| 84 |
Largest Rectangle in Histogram |
Hard |
c++ |
| 94 |
Binary Tree Inorder Traversal |
Medium |
c++ |
| 95 |
Unique Binary Search Trees II |
Medium |
c++ |
| 96 |
Unique Binary Search Trees |
Medium |
c++ |
| 98 |
Validate Binary Search Tree |
Medium |
c++ |
| 101 |
Symmetric Tree |
Easy |
c++ |
| 104 |
Maximum Depth of Binary Tree |
Easy |
c++ |
| 105 |
Construct Binary Tree from Preorder and Inorder Traversal |
Medium |
c++ |
| 106 |
Construct Binary Tree from Inorder and Postorder Traversal |
Medium |
c++ |
| 108 |
Convert Sorted Array to Binary Search Tree |
Easy |
c++ |
| 110 |
Balanced Binary Tree |
Easy |
c++ |
| 112 |
Path Sum |
Easy |
c++ |
| 116 |
Populating Next Right Pointers in Each Node |
Medium |
c++ |
| 118 |
Pascal's Triangle |
Easy |
c++ |
| 119 |
Pascal's Triangle II |
Easy |
c++ |
| 121 |
Best Time to Buy and Sell Stock |
Easy |
c++ |
| 133 |
Clone Graph |
Medium |
c++ |
| 136 |
Single Number |
Easy |
c++ |
| 138 |
Copy List with Random Pointer |
Medium |
c++ |
| 139 |
Word Break |
Medium |
c++ |
| 140 |
Word Break II |
Medium |
c++ |
| 141 |
Linked List Cycle |
Easy |
c++ |
| 142 |
Linked List Cycle II |
Medium |
c++ |
| 144 |
Binary Tree Preorder Traversal |
Medium |
c++ |
| 145 |
Binary Tree Postorder Traversal |
Hard |
c++ |
| 150 |
Evaluate Reverse Polish Notation |
Medium |
c++ |
| 151 |
Reverse Words in a String |
Medium |
c++ |
| 152 |
Maximum Product Subarray |
Medium |
c++ |
| 153 |
Find Minimum in Rotated Sorted Array |
Medium |
c++ |
| 154 |
Find Minimum in Rotated Sorted Array II |
Hard |
c++ |
| 155 |
Min Stack |
Easy |
c++ |
| 160 |
Intersection of Two Linked Lists |
Easy |
c++ |
| 162 |
Find Peak Element |
Medium |
c++ |
| 167 |
Two Sum II - Input array is sorted |
Easy |
c++ |
| 169 |
Majority Element |
Easy |
c++ |
| 173 |
Binary Search Tree Iterator |
Medium |
c++ |
| 189 |
Rotate Array |
Easy |
c++ |
| 198 |
House Robber |
Easy |
c++ |
| 199 |
Binary Tree Right Side View |
Medium |
c++ |
| 200 |
Number of Islands |
Medium |
c++ |
| 202 |
Happy Number |
Easy |
c++ |
| 203 |
Remove Linked List Elements |
Easy |
c++ |
| 205 |
Isomorphic Strings |
Easy |
c++ |
| 206 |
Reverse Linked List |
Easy |
c++ |
| 208 |
Implement Trie (Prefix Tree) |
Medium |
c++ |
| 209 |
Minimum Size Subarray Sum |
Medium |
c++ |
| 211 |
Add and Search Word - Data structure design |
Medium |
c++ |
| 212 |
Word Search II |
Hard |
c++ |
| 213 |
House Robber II |
Medium |
c++ |
| 217 |
Contains Duplicate |
Easy |
c++ |
| 219 |
Contains Duplicate II |
Easy |
c++ |
| 220 |
Contains Duplicate III |
Medium |
c++ |
| 221 |
Maximal Square |
Medium |
c++ |
| 225 |
Implement Stack using Queues |
Easy |
c++ |
| 232 |
Implement Queue using Stacks |
Easy |
c++ |
| 234 |
Palindrome Linked List |
Easy |
c++ |
| 238 |
Product of Array Except Self |
Medium |
c++ |
| 264 |
Ugly Number II |
Medium |
c++ |
| 278 |
First Bad Version |
Easy |
c++ |
| 279 |
Perfect Squares |
Medium |
c++ |
| 283 |
Move Zeroes |
Easy |
c++ |
| 287 |
Find the Duplicate Number |
Medium |
c++ |
| 297 |
Serialize and Deserialize Binary Tree |
Hard |
c++ |
| 300 |
Longest Increasing Subsequence |
Medium |
c++ |
| 303 |
Range Sum Query - Immutable |
Easy |
c++ |
| 328 |
Odd Even Linked List |
Medium |
c++ |
| 336 |
Palindrome Pairs |
Hard |
c++ |
| 338 |
Counting Bits |
Medium |
c++ |
| 343 |
Integer Break |
Medium |
c++ |
| 344 |
Reverse String |
Easy |
c++ |
| 345 |
Reverse Vowels of a String |
Easy |
c++ |
| 347 |
Top K Frequent Elements |
Medium |
c++ |
| 349 |
Intersection of Two Arrays |
Easy |
c++ |
| 350 |
Intersection of Two Arrays II |
Easy |
c++ |
| 355 |
Design Twitter |
Medium |
c++ |
| 357 |
Count Numbers with Unique Digits |
Medium |
c++ |
| 365 |
Water and Jug Problem |
Medium |
c++ |
| 367 |
Valid Perfect Square |
Easy |
c++ |
| 368 |
Largest Divisible Subset |
Medium |
c++ |
| 374 |
Guess Number Higher or Lower |
Easy |
c++ |
| 375 |
Guess Number Higher or Lower II |
Medium |
c++ |
| 376 |
Wiggle Subsequence |
Medium |
c++ |
| 377 |
Combination Sum IV |
Medium |
c++ |
| 378 |
Kth Smallest Element in a Sorted Matrix |
Medium |
c++ |
| 380 |
Insert Delete GetRandom O(1) |
Medium |
c++ |
| 383 |
Ransom Note |
Easy |
c++ |
| 387 |
First Unique Character in a String |
Easy |
c++ |
| 392 |
Is Subsequence |
Easy |
c++ |
| 394 |
Decode String |
Medium |
c++ |
| 409 |
Longest Palindrome |
Easy |
c++ |
| 413 |
Arithmetic Slices |
Medium |
c++ |
| 415 |
Add Strings |
Easy |
c++ |
| 416 |
Partition Equal Subset Sum |
Medium |
c++ |
| 421 |
Maximum XOR of Two Numbers in an Array |
Medium |
c++ |
| 429 |
N-ary Tree Level Order Traversal |
Medium |
c++ |
| 430 |
Flatten a Multilevel Doubly Linked List |
Medium |
c++ |
| 434 |
Number of Segments in a String |
Easy |
c++ |
| 443 |
String Compression |
Easy |
c++ |
| 445 |
Add Two Numbers II |
Medium |
c++ |
| 448 |
Find All Numbers Disappeared in an Array |
Easy |
c++ |
| 450 |
Delete Node in a BST |
Medium |
c++ |
| 454 |
4Sum II |
Medium |
c++ |
| 455 |
Assign Cookies |
Easy |
c++ |
| 459 |
Repeated Substring Pattern |
Easy |
c++ |
| 460 |
LFU Cache |
Hard |
c++ |
| 467 |
Unique Substrings in Wraparound String |
Medium |
c++ |
| 474 |
Ones and Zeroes |
Medium |
c++ |
| 485 |
Max Consecutive Ones |
Easy |
c++ |
| 494 |
Target Sum |
Medium |
c++ |
| 498 |
Diagonal Traverse |
Medium |
c++ |
| 516 |
Longest Palindromic Subsequence |
Medium |
c++ |
| 518 |
Coin Change 2 |
Medium |
c++ |
| 520 |
Detect Capital |
Easy |
c++ |
| 521 |
Longest Uncommon Subsequence I |
Easy |
c++ |
| 541 |
Reverse String II |
Easy |
c++ |
| 542 |
01 Matrix |
Medium |
c++ |
| 543 |
Diameter of Binary Tree |
Easy |
c++ |
| 551 |
Student Attendance Record I |
Easy |
c++ |
| 557 |
Reverse Words in a String III |
Easy |
c++ |
| 559 |
Maximum Depth of N-ary Tree |
Easy |
c++ |
| 561 |
Array Partition I |
Easy |
c++ |
| 566 |
Reshape the Matrix |
Easy |
c++ |
| 572 |
Subtree of Another Tree |
Easy |
c++ |
| 583 |
Delete Operation for Two Strings |
Medium |
c++ |
| 576 |
Out of Boundary Paths |
Medium |
c++ |
| 589 |
N-ary Tree Preorder Traversal |
Easy |
c++ |
| 590 |
N-ary Tree Postorder Traversal |
Easy |
c++ |
| 599 |
Minimum Index Sum of Two Lists |
Easy |
c++ |
| 605 |
Can Place Flowers |
Easy |
c++ |
| 606 |
Construct String from Binary Tree |
Easy |
c++ |
| 622 |
Design Circular Queue |
Medium |
c++ |
| 638 |
Shopping Offers |
Medium |
c++ |
| 648 |
Replace Words |
Medium |
c++ |
| 650 |
2 Keys Keyboard |
Medium |
c++ |
| 652 |
Find Duplicate Subtrees |
Medium |
c++ |
| 658 |
Find K Closest Elements |
Medium |
c++ |
| 673 |
Number of Longest Increasing Subsequence |
Medium |
c++ |
| 677 |
Map Sum Pairs |
Medium |
c++ |
| 688 |
Knight Probability in Chessboard |
Medium |
c++ |
| 695 |
Max Area of Island |
Medium |
c++ |
| 698 |
Partition to K Equal Sum Subsets |
Medium |
c++ |
| 700 |
Search in a Binary Search Tree |
Easy |
c++ |
| 701 |
Insert into a Binary Search Tree |
Medium |
c++ |
| 704 |
Binary Search |
Easy |
c++ |
| 705 |
Design HashSet |
Easy |
c++ |
| 706 |
Design HashMap |
Easy |
c++ |
| 707 |
Design Linked List |
Medium |
c++ |
| 709 |
To Lower Case |
Easy |
c++ |
| 712 |
Minimum ASCII Delete Sum for Two Strings |
Medium |
c++ |
| 718 |
Maximum Length of Repeated Subarray |
Medium |
c++ |
| 724 |
Find Pivot Index |
Easy |
c++ |
| 733 |
Flood Fill |
Easy |
c++ |
| 739 |
Daily Temperatures |
Medium |
c++ |
| 740 |
Delete and Earn |
Medium |
c++ |
| 744 |
Find Smallest Letter Greater Than Target |
Easy |
c++ |
| 746 |
Min Cost Climbing Stairs |
Easy |
c++ |
| 747 |
Largest Number At Least Twice of Others |
Easy |
c++ |
| 752 |
Open the Lock |
Medium |
c++ |
| 771 |
Jewels and Stones |
Easy |
c++ |
| 779 |
K-th Symbol in Grammar |
Medium |
c++ |
| 820 |
Short Encoding of Words |
Medium |
c++ |
| 836 |
Rectangle Overlap |
Easy |
c++ |
| 841 |
Keys and Rooms |
Medium |
c++ |
| 860 |
Lemonade Change |
Easy |
c++ |
| 876 |
Middle of the Linked List |
Easy |
c++ |
| 877 |
Stone Game |
Medium |
c++ |
| 892 |
Surface Area of 3D Shapes |
Easy |
c++ |
| 944 |
Delete Columns to Make Sorted |
Easy |
c++ |
| 945 |
Minimum Increment to Make Array Unique |
Medium |
c++ |
| 983 |
Minimum Cost For Tickets |
Medium |
c++ |
| 994 |
Rotting Oranges |
Easy |
c++ |
| 1005 |
Maximize Sum Of Array After K Negations |
Easy |
c++ |
| 1013 |
Partition Array Into Three Parts With Equal Sum |
Easy |
c++ |
| 1025 |
Divisor Game |
Easy |
c++ |
| 1029 |
Two City Scheduling |
Easy |
c++ |
| 1035 |
Uncrossed Lines |
Medium |
c++ |
| 1049 |
Last Stone Weight |
Easy |
c++ |
| 1071 |
Greatest Common Divisor of Strings |
Easy |
c++ |
| 1095 |
Find in Mountain Array |
Hard |
c++ |
| 1103 |
Distribute Candies to People |
Easy |
c++ |
| 1160 |
Find Words That Can Be Formed by Characters |
Easy |
c++ |
| 1162 |
As Far from Land as Possible |
Medium |
c++ |
| 1217 |
Play with Chips |
Easy |
c++ |
| 1221 |
Split a String in Balanced Strings |
Easy |
c++ |
| 1248 |
Count Number of Nice Subarrays |
Medium |
c++ |
| 1277 |
Count Square Submatrices with All Ones |
Medium |
c++ |
| 1300 |
Sum of Mutated Array Closest to Target |
Medium |
c++ |