Contains Duplicate

LC 217 · 271 modes

Palindrome Number

LC 9 · 40 modes

Roman to Integer

LC 13 · 40 modes

Merge Sorted Array

LC 88 · 39 modes

Convert Sorted Array to Binary Search Tree

LC 108 · 31 modes

Excel Sheet Column Title

LC 168 · 24 modes

Majority Element

LC 169 · 38 modes

Isomorphic Strings

LC 205 · 38 modes

Move Zeroes

LC 283 · 41 modes

First Unique Character in a String

LC 387 · 23 modes

Find All Numbers Disappeared in an Array

LC 448 · 39 modes

Fibonacci Number

LC 509 · 23 modes

Reverse Words in a String III

LC 557 · 18 modes

Can Place Flowers

LC 605 · 39 modes

Valid Palindrome II

LC 680 · 42 modes

Jewels and Stones

LC 771 · 22 modes

Matrix Cells in Distance Order

LC 1030 · 19 modes

Defanging an IP Address

LC 1108 · 18 modes

Valid Anagram

LC 242 · 262 modes

Two Sum

LC 1 · 270 modes

4Sum

LC 18 · 38 modes

Find First and Last Position of Element in Sorted Array

LC 34 · 31 modes

Sort Colors

LC 75 · 42 modes

Combinations

LC 77 · 32 modes

Restore IP Addresses

LC 93 · 34 modes

Best Time to Buy and Sell Stock II

LC 122 · 35 modes

Find Peak Element

LC 162 · 32 modes

Count Primes

LC 204 · 23 modes

Count Complete Tree Nodes

LC 222 · 21 modes

Search a 2D Matrix II

LC 240 · 23 modes

Single Number III

LC 260 · 19 modes

H-Index

LC 274 · 25 modes

Peeking Iterator

LC 284 · 18 modes

Remove Duplicate Letters

LC 316 · 19 modes

Increasing Triplet Subsequence

LC 334 · 25 modes

Design Hit Counter

LC 362 · 23 modes

Kth Smallest Element in a Sorted Matrix

LC 378 · 22 modes

Shuffle an Array

LC 384 · 19 modes

Decode String

LC 394 · 34 modes

Next Greater Element II

LC 503 · 22 modes

Subarray Sum Equals K

LC 560 · 41 modes

Maximum Distance in Arrays

LC 624 · 23 modes

All Nodes Distance K in Binary Tree

LC 863 · 20 modes

Group Anagrams

LC 49 · 262 modes

Top K Frequent Elements

LC 347 · 264 modes

Product of Array Except Self

LC 238 · 255 modes

Longest Valid Parentheses

LC 32 · 23 modes

Permutation Sequence

LC 60 · 20 modes

Word Ladder II

LC 126 · 22 modes

Integer to English Words

LC 273 · 23 modes

Largest Palindrome Product

LC 479 · 23 modes

Optimize Water Distribution in a Village

LC 1168 · 19 modes

Integer to Roman

LC 12 · 35 modes

3Sum

LC 15 · 264 modes

Container With Most Water

LC 11 · 257 modes

Trapping Rain Water

LC 42 · 263 modes

Best Time to Buy And Sell Stock

LC 121 · 262 modes

Longest Substring Without Repeating Characters

LC 3 · 257 modes

Permutation In String

LC 567 · 254 modes

Minimum Window Substring

LC 76 · 256 modes

Valid Parentheses

LC 20 · 267 modes

Implement Stack using Queues

LC 225 · 40 modes

Implement Queue using Stacks

LC 232 · 20 modes

Search In Rotated Sorted Array

LC 33 · 256 modes

Median of Two Sorted Arrays

LC 4 · 257 modes

Reverse Linked List

LC 206 · 260 modes

Merge Two Sorted Lists

LC 21 · 251 modes

Linked List Cycle

LC 141 · 247 modes

Copy List With Random Pointer

LC 138 · 246 modes

Add Two Numbers

LC 2 · 255 modes

LRU Cache

LC 146 · 250 modes

Merge K Sorted Lists

LC 23 · 254 modes

Intersection of Two Linked Lists

LC 160 · 28 modes

Maximum Depth of Binary Tree

LC 104 · 258 modes

Unique Binary Search Trees II

LC 95 · 21 modes

Binary Tree Zigzag Level Order Traversal

LC 103 · 26 modes

Flatten Binary Tree to Linked List

LC 114 · 19 modes

Lowest Common Ancestor of a Binary Tree

LC 236 · 20 modes

Delete Node in a Linked List

LC 237 · 14 modes

Add Two Numbers II

LC 445 · 23 modes

Delete Node in a BST

LC 450 · 32 modes

Trim a Binary Search Tree

LC 669 · 31 modes

Binary Tree Level Order Traversal

LC 102 · 259 modes

Validate Binary Search Tree

LC 98 · 258 modes

Construct Binary Tree From Preorder And Inorder Traversal

LC 105 · 255 modes

Serialize And Deserialize Binary Tree

LC 297 · 253 modes

K Closest Points to Origin

LC 973 · 249 modes

Kth Largest Element In An Array

LC 215 · 249 modes

Find Median From Data Stream

LC 295 · 248 modes

Subsets

LC 78 · 256 modes

Permutations

LC 46 · 255 modes

Generate Parentheses

LC 22 · 254 modes

Word Search

LC 79 · 252 modes

Palindrome Partitioning

LC 131 · 255 modes

Letter Combinations of a Phone Number

LC 17 · 255 modes

Word Search II

LC 212 · 247 modes

Binary Number with Alternating Bits

LC 693 · 23 modes

Number of Islands

LC 200 · 261 modes

Course Schedule

LC 207 · 250 modes

Climbing Stairs

LC 70 · 262 modes

Min Cost Climbing Stairs

LC 746 · 256 modes

Longest Palindromic Substring

LC 5 · 258 modes

Coin Change

LC 322 · 262 modes

Word Break

LC 139 · 254 modes

Partition Equal Subset Sum

LC 416 · 249 modes

Edit Distance

LC 72 · 244 modes

Maximum Subarray

LC 53 · 260 modes

Valid Parenthesis String

LC 678 · 246 modes

Merge Intervals

LC 56 · 261 modes

Reverse Integer

LC 7 · 251 modes