Contains Duplicate

LC 217 · 271 modes

Summary Ranges

LC 228 · 18 modes

Shortest Word Distance

LC 243 · 15 modes

Palindrome Permutation

LC 266 · 16 modes

Word Pattern

LC 290 · 33 modes

Intersection of Two Arrays

LC 349 · 13 modes

Intersection of Two Arrays II

LC 350 · 12 modes

Logger Rate Limiter

LC 359 · 12 modes

Design HashMap

LC 706 · 21 modes

Valid Mountain Array

LC 941 · 13 modes

Valid Anagram

LC 242 · 255 modes

Two Sum

LC 1 · 263 modes

Rotate Array

LC 189 · 29 modes

Majority Element II

LC 229 · 13 modes

Shortest Word Distance II

LC 244 · 15 modes

Group Shifted Strings

LC 249 · 11 modes

Flatten 2D Vector

LC 251 · 15 modes

Bulls and Cows

LC 299 · 14 modes

Design Snake Game

LC 353 · 7 modes

Design Hit Counter

LC 362 · 16 modes

Insert Delete GetRandom O(1)

LC 380 · 21 modes

Random Pick Index

LC 398 · 15 modes

Sort Characters By Frequency

LC 451 · 13 modes

Encode and Decode TinyURL

LC 535 · 30 modes

Subarray Sum Equals K

LC 560 · 33 modes

Shortest Unsorted Continuous Subarray

LC 581 · 16 modes

Remove Comments

LC 722 · 13 modes

Max Chunks To Make Sorted

LC 769 · 13 modes

Custom Sort String

LC 791 · 15 modes

Array of Doubled Pairs

LC 954 · 12 modes

Snapshot Array

LC 1146 · 12 modes

Cache With Time Limit

14 modes

Number of Adjacent Elements With the Same Color

20 modes

Number of Black Blocks

20 modes

Check if a String Is an Acronym of Words

20 modes

Number of Subarrays That Match a Pattern I

20 modes

Maximum Increasing Triplet Value

20 modes

Points That Intersect With Cars

20 modes

Group Anagrams

LC 49 · 255 modes

Top K Frequent Elements

LC 347 · 257 modes

Product of Array Except Self

LC 238 · 248 modes

Valid Sudoku

LC 36 · 249 modes

Longest Consecutive Sequence

LC 128 · 258 modes

First Missing Positive

LC 41 · 30 modes

Count of Smaller Numbers After Self

LC 315 · 10 modes

Insert Delete GetRandom O(1) - Duplicates allowed

LC 381 · 12 modes

All O`one Data Structure

LC 432 · 14 modes

LFU Cache

LC 460 · 8 modes

Word Abbreviation

LC 527 · 15 modes

Random Pick with Blacklist

LC 710 · 14 modes

Valid Palindrome

LC 125 · 257 modes

Remove Duplicates from Sorted Array

LC 26 · 30 modes

Merge Sorted Array

LC 88 · 32 modes

Move Zeroes

LC 283 · 41 modes

Reverse String

LC 344 · 30 modes

Squares of a Sorted Array

LC 977 · 34 modes

Find the Distance Value Between Two Arrays

LC 1385 · 14 modes

3Sum Closest

LC 16 · 16 modes

Sort Colors

LC 75 · 35 modes

One Edit Distance

LC 161 · 16 modes

Reverse Words in a String II

LC 186 · 13 modes

Valid Triangle Number

LC 611 · 16 modes

3Sum

LC 15 · 257 modes

Container With Most Water

LC 11 · 250 modes

Find The Duplicate Number

LC 287 · 245 modes

Read N Characters Given read4 II - Call Multiple Times

LC 158 · 16 modes

Trapping Rain Water

LC 42 · 256 modes

Best Time to Buy And Sell Stock

LC 121 · 262 modes

Moving Average from Data Stream

LC 346 · 15 modes

Longest Substring with At Most K Distinct Characters

LC 340 · 16 modes

Longest Substring with At Least K Repeating Characters

LC 395 · 16 modes

Find All Anagrams in a String

LC 438 · 27 modes

Minimum Operations to Make Binary Array Elements Equal to One I

20 modes

Best Time to Buy and Sell Stock using Strategy

20 modes

Find Pattern in Infinite Stream I

20 modes

Find Pattern in Infinite Stream II

20 modes

Longest Substring Without Repeating Characters

LC 3 · 250 modes

Longest Repeating Character Replacement

LC 424 · 250 modes

Permutation In String

LC 567 · 247 modes

Subarrays with K Different Integers

LC 992 · 16 modes

Minimum Window Substring

LC 76 · 249 modes

Sliding Window Maximum

LC 239 · 249 modes

Valid Parentheses

LC 20 · 260 modes

Implement Queue using Stacks

LC 232 · 11 modes

Backspace String Compare

LC 844 · 16 modes

Basic Calculator II

LC 227 · 14 modes

Verify Preorder Sequence in Binary Search Tree

LC 255 · 12 modes

Flatten Nested List Iterator

LC 341 · 16 modes

Longest Absolute File Path

LC 388 · 16 modes

Exclusive Time of Functions

LC 636 · 16 modes

Asteroid Collision

LC 735 · 28 modes

Next Greater Node In Linked List

LC 1019 · 13 modes

Min Stack

LC 155 · 245 modes

Evaluate Reverse Polish Notation

LC 150 · 246 modes

Daily Temperatures

LC 739 · 245 modes

Longest Valid Parentheses

LC 32 · 16 modes

Basic Calculator

LC 224 · 15 modes

Tag Validator

LC 591 · 8 modes

Basic Calculator III

LC 772 · 9 modes

Largest Rectangle In Histogram

LC 84 · 247 modes

Binary Search

LC 704 · 262 modes

Sqrt(x)

LC 69 · 25 modes

First Bad Version

LC 278 · 9 modes

Fixed Point

LC 1064 · 12 modes

Find First and Last Position of Element in Sorted Array

LC 34 · 24 modes

Find Peak Element

LC 162 · 25 modes

Random Pick with Weight

LC 528 · 11 modes

Find K Closest Elements

LC 658 · 23 modes

Peak Index in a Mountain Array

LC 852 · 13 modes

Capacity To Ship Packages Within D Days

LC 1011 · 19 modes

Minimum Absolute Difference Between Elements With Constraint

20 modes

Zero Array Transformation II

17 modes

Maximum Number of Alloys

20 modes

Search a 2D Matrix

LC 74 · 248 modes

Find Minimum In Rotated Sorted Array

LC 153 · 250 modes

Search In Rotated Sorted Array

LC 33 · 249 modes

Time Based Key Value Store

LC 981 · 249 modes

Find Minimum in Rotated Sorted Array II

LC 154 · 14 modes

Reverse Pairs

LC 493 · 16 modes

Kth Smallest Number in Multiplication Table

LC 668 · 14 modes

Median of Two Sorted Arrays

LC 4 · 250 modes

Reverse Linked List

LC 206 · 253 modes

Remove Linked List Elements

LC 203 · 31 modes

Merge Two Sorted Lists

LC 21 · 244 modes

Swap Nodes in Pairs

LC 24 · 22 modes

Flatten a Multilevel Doubly Linked List

LC 430 · 13 modes

Add Two Numbers II

LC 445 · 16 modes

Remove Zero Sum Consecutive Nodes from Linked List

LC 1171 · 12 modes

Reorder List

LC 143 · 237 modes

Remove Nth Node From End of List

LC 19 · 249 modes

Copy List With Random Pointer

LC 138 · 239 modes

Add Two Numbers

LC 2 · 248 modes

LRU Cache

LC 146 · 243 modes

Invert Binary Tree

LC 226 · 256 modes

Binary Tree Inorder Traversal

LC 94 · 28 modes

Symmetric Tree

LC 101 · 19 modes

Binary Tree Postorder Traversal

LC 145 · 21 modes

Second Minimum Node In a Binary Tree

LC 671 · 13 modes

Maximum Depth of Binary Tree

LC 104 · 251 modes

Recover Binary Search Tree

LC 99 · 7 modes

Flatten Binary Tree to Linked List

LC 114 · 12 modes

Binary Search Tree Iterator

LC 173 · 19 modes

Lowest Common Ancestor of a Binary Tree

LC 236 · 13 modes

Binary Tree Longest Consecutive Sequence

LC 298 · 15 modes

House Robber III

LC 337 · 15 modes

Nested List Weight Sum

LC 339 · 11 modes

Convert Binary Search Tree to Sorted Doubly Linked List

LC 426 · 9 modes

Construct Quad Tree

LC 427 · 13 modes

Path Sum III

LC 437 · 16 modes

Serialize and Deserialize BST

LC 449 · 11 modes

Delete Node in a BST

LC 450 · 23 modes

Find Duplicate Subtrees

LC 652 · 14 modes

Print Binary Tree

LC 655 · 12 modes

Maximum Width of Binary Tree

LC 662 · 18 modes

All Nodes Distance K in Binary Tree

LC 863 · 11 modes

Construct Binary Tree from Preorder and Postorder Traversal

LC 889 · 16 modes

Distribute Coins in Binary Tree

LC 979 · 16 modes

Binary Search Tree to Greater Sum Tree

LC 1038 · 15 modes

Count Paths That Can Form a Palindrome in a Tree

14 modes

Minimum Edge Reversals So Every Node Is Reachable

14 modes

Lowest Common Ancestor of a Binary Search Tree

LC 235 · 247 modes

Binary Tree Level Order Traversal

LC 102 · 252 modes

Binary Tree Right Side View

LC 199 · 252 modes

Validate Binary Search Tree

LC 98 · 251 modes

Kth Smallest Element In a Bst

LC 230 · 251 modes

Construct Binary Tree From Preorder And Inorder Traversal

LC 105 · 248 modes

Serialize and Deserialize N-ary Tree

LC 428 · 10 modes

Binary Tree Cameras

LC 968 · 16 modes

Binary Tree Maximum Path Sum

LC 124 · 250 modes

Serialize And Deserialize Binary Tree

LC 297 · 246 modes

Ugly Number II

LC 264 · 14 modes

Find K Pairs with Smallest Sums

LC 373 · 16 modes

Kth Smallest Element in a Sorted Matrix

LC 378 · 15 modes

Top K Frequent Words

LC 692 · 15 modes

Reorganize String

LC 767 · 21 modes

Exam Room

LC 855 · 16 modes

Continuous Subarrays

20 modes

K Closest Points to Origin

LC 973 · 242 modes

Kth Largest Element In An Array

LC 215 · 242 modes

Task Scheduler

LC 621 · 242 modes

The Skyline Problem

LC 218 · 16 modes

Maximum Frequency Stack

LC 895 · 24 modes

Find Median From Data Stream

LC 295 · 241 modes

Merge K Sorted Lists

LC 23 · 247 modes

Subsets

LC 78 · 249 modes

Permutations II

LC 47 · 19 modes

Factor Combinations

LC 254 · 16 modes

Palindrome Permutation II

LC 267 · 12 modes

Word Pattern II

LC 291 · 12 modes

Combination Sum

LC 39 · 248 modes

Combination Sum II

LC 40 · 246 modes

Permutations

LC 46 · 248 modes

Generate Parentheses

LC 22 · 247 modes

Word Search

LC 79 · 245 modes

Palindrome Partitioning

LC 131 · 248 modes

Letter Combinations of a Phone Number

LC 17 · 248 modes

Sudoku Solver

LC 37 · 10 modes

Word Break II

LC 140 · 12 modes

Expression Add Operators

LC 282 · 14 modes

Remove Invalid Parentheses

LC 301 · 13 modes

Optimal Account Balancing

LC 465 · 14 modes

24 Game

LC 679 · 14 modes

N Queens

LC 51 · 248 modes

Implement Trie Prefix Tree

LC 208 · 243 modes

Replace Words

LC 648 · 15 modes

Find the Length of the Longest Common Prefix

15 modes

Count Prefix and Suffix Pairs II

17 modes

Palindrome Pairs

LC 336 · 14 modes

Design Search Autocomplete System

LC 642 · 14 modes

Word Search II

LC 212 · 240 modes

Flood Fill

LC 733 · 13 modes

Number of Islands

LC 200 · 254 modes

Find the Celebrity

LC 277 · 16 modes

Evaluate Division

LC 399 · 13 modes

The Maze

LC 490 · 12 modes

Minesweeper

LC 529 · 10 modes

01 Matrix

LC 542 · 14 modes

Employee Importance

LC 690 · 10 modes

Number of Distinct Islands

LC 694 · 16 modes

Open the Lock

LC 752 · 14 modes

Snakes and Ladders

LC 909 · 21 modes

Shortest Bridge

LC 934 · 8 modes

Regions Cut By Slashes

LC 959 · 11 modes

Shortest Path in Binary Matrix

LC 1091 · 19 modes

Parallel Courses

LC 1136 · 13 modes

Course Schedule IV

LC 1462 · 15 modes

Find Minimum Time to Reach Last Room I

14 modes

Check if the Rectangle Corner Is Reachable

20 modes

Maximize Amount After Two Days of Conversions

10 modes

Max Area of Island

LC 695 · 249 modes

Clone Graph

LC 133 · 244 modes

Walls And Gates

LC 286 · 236 modes

Pacific Atlantic Water Flow

LC 417 · 249 modes

Surrounded Regions

LC 130 · 244 modes

Course Schedule

LC 207 · 243 modes

Course Schedule II

LC 210 · 244 modes

Word Ladder II

LC 126 · 12 modes

Number of Islands II

LC 305 · 8 modes

Shortest Distance from All Buildings

LC 317 · 8 modes

Sliding Puzzle

LC 773 · 7 modes

Bus Routes

LC 815 · 14 modes

Making A Large Island

LC 827 · 12 modes

Word Ladder

LC 127 · 248 modes

Connecting Cities With Minimum Cost

LC 1135 · 16 modes

Find the City With the Smallest Number of Neighbors at a Threshold Distance

LC 1334 · 13 modes

Find Minimum Time to Reach Last Room II

14 modes

Block Placement Queries

20 modes

Minimize the Maximum Edge Weight of Graph

11 modes

Reconstruct Itinerary

LC 332 · 244 modes

Alien Dictionary

LC 269 · 237 modes

Climbing Stairs

LC 70 · 255 modes

Maximum Subarray

LC 53 · 260 modes

Perfect Squares

LC 279 · 21 modes

Wiggle Subsequence

LC 376 · 12 modes

Delete and Earn

LC 740 · 22 modes

New 21 Game

LC 837 · 14 modes

Maximum Sum Circular Subarray

LC 918 · 32 modes

Minimum Cost For Tickets

LC 983 · 18 modes

Find the Maximum Length of Valid Subsequence II

20 modes

Maximum Coin Collection

20 modes

Minimum Operations to Make Binary Array Elements Equal to One II

20 modes

House Robber

LC 198 · 250 modes

Longest Palindromic Substring

LC 5 · 251 modes

Palindromic Substrings

LC 647 · 248 modes

Decode Ways

LC 91 · 246 modes

Coin Change

LC 322 · 255 modes

Maximum Product Subarray

LC 152 · 246 modes

Word Break

LC 139 · 247 modes

Longest Increasing Subsequence

LC 300 · 256 modes

Partition Equal Subset Sum

LC 416 · 242 modes

Student Attendance Record II

LC 552 · 9 modes

Split Array With Same Average

LC 805 · 16 modes

Unique Paths

LC 62 · 248 modes

Minimum Path Sum

LC 64 · 22 modes

Maximal Square

LC 221 · 23 modes

Bomb Enemy

LC 361 · 16 modes

Predict the Winner

LC 486 · 16 modes

Longest Palindromic Subsequence

LC 516 · 18 modes

Minimum Score Triangulation of Polygon

LC 1039 · 16 modes

Interleaving String

LC 97 · 245 modes

Edit Distance

LC 72 · 237 modes

Maximal Rectangle

LC 85 · 16 modes

Maximum Vacation Days

LC 568 · 16 modes

Cherry Pickup

LC 741 · 16 modes

Palindrome Partitioning III

LC 1278 · 15 modes

Longest Increasing Path In a Matrix

LC 329 · 243 modes

Burst Balloons

LC 312 · 242 modes

Regular Expression Matching

LC 10 · 247 modes

Best Time to Buy and Sell Stock II

LC 122 · 28 modes

Increasing Triplet Subsequence

LC 334 · 18 modes

Maximum Swap

LC 670 · 15 modes

Most Profit Assigning Work

LC 826 · 15 modes

Pancake Sorting

LC 969 · 12 modes

Construct K Palindrome Strings

LC 1400 · 14 modes

Minimum Cost to Equalize Arrays Using Swaps

20 modes

Jump Game

LC 55 · 246 modes

Jump Game II

LC 45 · 242 modes

Text Justification

LC 68 · 16 modes

Candy

LC 135 · 17 modes

Strong Password Checker

LC 420 · 8 modes

Set Intersection Size At Least Two

LC 757 · 16 modes

Stamping The Sequence

LC 936 · 10 modes

Insert Interval

LC 57 · 247 modes

Maximum Length of Pair Chain

LC 646 · 16 modes

My Calendar I

LC 729 · 15 modes

Interval List Intersections

LC 986 · 16 modes

Meeting Scheduler

LC 1229 · 12 modes

Merge Intervals

LC 56 · 254 modes

Meeting Rooms II

LC 253 · 239 modes

Falling Squares

LC 699 · 10 modes

Employee Free Time

LC 759 · 12 modes

Roman to Integer

LC 13 · 33 modes

Pascal's Triangle

LC 118 · 30 modes

Excel Sheet Column Number

LC 171 · 14 modes

Subtract the Product and Sum of Digits of an Integer

LC 1281 · 16 modes

Happy Number

LC 202 · 245 modes

Plus One

LC 66 · 244 modes

Rotate Image

LC 48 · 245 modes

Zigzag Conversion

LC 6 · 25 modes

String to Integer (atoi)

LC 8 · 16 modes

Next Permutation

LC 31 · 15 modes

Spiral Matrix II

LC 59 · 14 modes

Fraction to Recurring Decimal

LC 166 · 16 modes

Game of Life

LC 289 · 13 modes

Sparse Matrix Multiplication

LC 311 · 15 modes

Design Tic-Tac-Toe

LC 348 · 12 modes

Water and Jug Problem

LC 365 · 16 modes

Validate IP Address

LC 468 · 14 modes

Solve the Equation

LC 640 · 12 modes

Next Closest Time

LC 681 · 12 modes

Count the Number of Infection Sequences

20 modes

Maximum Manhattan Distance After K Changes

20 modes

Find the Number of Ways to Place People II

20 modes

Minimum Operations to Write the Letter Y on a Grid

20 modes

Match Alphanumerical Pattern in Matrix I

11 modes

Number of Ways to Reach Destination in the Grid

20 modes

Spiral Matrix

LC 54 · 243 modes

Pow(x, n)

LC 50 · 239 modes

Multiply Strings

LC 43 · 239 modes

Reverse Integer

LC 7 · 244 modes

Max Points on a Line

LC 149 · 28 modes

Integer to English Words

LC 273 · 16 modes

Perfect Rectangle

LC 391 · 15 modes

Find the Closest Palindrome

LC 564 · 16 modes

Reaching Points

LC 780 · 16 modes

Consecutive Numbers Sum

LC 829 · 16 modes

Single Number

LC 136 · 249 modes

Counting Bits

LC 338 · 244 modes