- 27 Remove Element
- 26 Remove Duplicates from Sorted Array
- 80 Remove Duplicates from Sorted Array II
- 277 Find the Celebrity
- 189 Rotate Array
- 41 First Missing Positive
- 299 Bulls and Cows
- 134 Gas Station
- 118 Pascal's Triangle 很少考
- 119 Pascal's Triangle II 很少考
- 169 Majority Element 很少考
- 229 Majority Element II 很少考
- 274 H-Index
- 275 H-Index II Binary Search
- 243 Shortest Word Distance
- 244 Shortest Word Distance II
- 245 Shortest Word Distance III
- 217 Contains Duplicate
- 219 Contains Duplicate II 很少考
- 220 Contains Duplicate III 很少考
- 55 Jump Game
- 45 Jump Game II
- 121 Best Time to Buy and Sell Stock
- 122 Best Time to Buy and Sell Stock II
- 123 Best Time to Buy and Sell Stock III
- 188 Best Time to Buy and Sell Stock IV
- 309 Best Time to Buy and Sell Stock with Cooldown
- 11 Container With Most Water
- 42 Trapping Rain Water
- 334 Increasing Triplet Subsequence
- 128 Longest Consecutive Sequence
- 164 Maximum Gap Bucket
- 287 Find the Duplicate Number
- 135 Candy 很少考
- 330 Patching Array 很少考
- 560 Subarray Sum Equals K
- 4 Median of Two Sorted Arrays 很少考
- 321 Create Maximum Number 很少考
- 327 Count of Range Sum
- 289 Game of Life
- 406 Queue Reconstruction by Height
- 57 Insert Interval
- 56 Merge Intervals
- 252 Meeting Rooms
- 253 Meeting Rooms II
- 352 Data Stream as Disjoint Intervals TreeMap
- 239 Sliding Window Maximum
- 295 Find Median from Data Stream
- 53 Maximum Subarray
- 325 Maximum Size Subarray Sum Equals k
- 209 Minimum Size Subarray Sum
- 238 Product of Array Except Self
- 152 Maximum Product Subarray
- 228 Summary Ranges
- 163 Missing Ranges
- 88 Merge Sorted Array
- 75 Sort Colors
- 283 Move Zeroes
- 376 Wiggle Subsequence
- 280 Wiggle Sort
- 324 Wiggle Sort II
- 278 First Bad Version
- 35 Search Insert Position
- 33 Search in Rotated Sorted Array
- 81 Search in Rotated Sorted Array II
- 153 Find Minimum in Rotated Sorted Array
- 154 Find Minimum in Rotated Sorted Array II
- 162 Find Peak Element
- 374 Guess Number Higher or Lower
- 34 Find First and Last Position of Element in Sorted Array
- 349 Intersection of Two Arrays
- 350 Intersection of Two Arrays II
- 315 Count of Smaller Numbers After Self
- 300 Longest Increasing Subsequence
- 354 Russian Doll Envelopes
- 28 Implement strStr()
- 14 Longest Common Prefix
- 58 Length of Last Word
- 387 First Unique Character in a String
- 383 Ransom Note
- 344 Reverse String
- 151 Reverse Words in a String
- 186 Reverse Words in a String II
- 345 Reverse Vowels of a String
- 205 Isomorphic Strings
- 293 Flip Game
- 294 Flip Game II
- 290 Word Pattern
- 242 Valid Anagram
- 49 Group Anagrams
- 249 Group Shifted Strings
- 87 Scramble String
- 179 Largest Number 很少考
- 6 ZigZag Conversion 很少考
- 161 One Edit Distance
- 38 Count and Say
- 358 Rearrange String k Distance Apart
- 316 Remove Duplicate Letters
- 271 Encode and Decode Strings
- 168 Excel Sheet Column Title
- 171 Excel Sheet Column Number
- 13 Roman to Integer
- 12 Integer to Roman
- 273 Integer to English Words
- 246 Strobogrammatic Number
- 247 Strobogrammatic Number II
- 248 Strobogrammatic Number III 很少考
- 157 Read N Characters Given Read4
- 158 Read N Characters Given Read4 II - Call multiple times
- 68 Text Justification
- 65 Valid Number
- 76 Minimum Window Substring Sliding Window
- 30 Substring with Concatenation of All Words Sliding Window
- 3 Longest Substring Without Repeating Characters Sliding Window
- 340 Longest Substring with At Most K Distinct Characters Sliding Window
- 395 Longest Substring with At Least K Repeating Characters Sliding Window
- 159 Longest Substring with At Most Two Distinct Characters Sliding Window
- 125 Valid Palindrome
- 266 Palindrome Permutation
- 5 Longest Palindromic Substring
- 9 Palindrome Number
- 214 Shortest Palindrome
- 336 Palindrome Pairs
- 131 Palindrome Partitioning
- 132 Palindrome Partitioning II
- 267 Palindrome Permutation II
- 20 Valid Parentheses
- 22 Generate Parentheses
- 32 Longest Valid Parentheses
- 241 Different Ways to Add Parentheses
- 301 Remove Invalid Parentheses
- 392 Is Subsequence
- 115 Distinct Subsequences
- 187 Repeated DNA Sequences 很少考
- 7 Reverse Integer
- 165 Compare Version Numbers
- 66 Plus One
- 8 String to Integer (atoi)
- 258 Add Digits
- 67 Add Binary
- 43 Multiply Strings
- 29 Divide Two Integers
- 69 Sqrt(x)
- 50 Pow(x, n)
- 367 Valid Perfect Square
- 365 Water and Jug Problem
- 204 Count Primes
- 1 Two Sum
- 167 Two Sum II - Input array is sorted
- 15 3Sum
- 16 3Sum Closest 很少考
- 259 3Sum Smaller 很少考
- 18 4Sum
- 478 Generate Random Point in a Circle
- 231 Power of Two
- 326 Power of Three
- 342 Power of Four
- 372 Super Pow
- 233 Number of Digit One
- 319 Bulb Switcher
- 292 Nim Game
- 202 Happy Number
- 400 Nth Digit
- 263 Ugly Number
- 264 Ugly Number II
- 306 Additive Number
- 172 Factorial Trailing Zeroes
- 343 Integer Break
- 396 Rotate Function
- 390 Elimination Game
- 386 Lexicographical Numbers
- 357 Count Numbers with Unique Digits
- 360 Sort Transformed Array
- 397 Integer Replacement
- 368 Largest Divisible Subset
- 621 Task Scheduler
- 2400 Number of Ways to Reach a Position After Exactly k Steps
- 1232 Check If It Is a Straight Line
- 1266 Minimum Time Visiting All Points
- 1401 Circle and Rectangle Overlapping
- 818 Race Car
- 144 Binary Tree Preorder Traversal
- 94 Binary Tree Inorder Traversal
- 145 Binary Tree Postorder Traversal
- 102 Binary Tree Level Order Traversal
- 100 Same Tree
- 101 Symmetric Tree
- 226 Invert Binary Tree preorder + BFS
- 257 Binary Tree Paths
- 112 Path Sum
- 113 Path Sum II
- 129 Sum Root to Leaf Numbers
- 298 Binary Tree Longest Consecutive Sequence
- 111 Minimum Depth of Binary Tree
- 104 Maximum Depth of Binary Tree
- 110 Balanced Binary Tree
- 124 Binary Tree Maximum Path Sum
- 250 Count Univalue Subtrees
- 366 Find Leaves of Binary Tree
- 337 House Robber III postorder + preorder
- 437 Path Sum III
- 863 All Nodes Distance K in Binary Tree
- 107 Binary Tree Level Order Traversal II
- 103 Binary Tree Zigzag Level Order Traversal
- 199 Binary Tree Right Side View BFS + preorder
- 98 Validate Binary Search Tree preorder
- 235 Lowest Common Ancestor of a Binary Search Tree preorder
- 236 Lowest Common Ancestor of a Binary Tree postorder
- 108 Convert Sorted Array to Binary Search Tree binary search
- 109 Convert Sorted List to Binary Search Tree binary search
- 173 Binary Search Tree Iterator inorder
- 230 Kth Smallest Element in a BST inorder
- 297 Serialize and Deserialize Binary Tree BFS
- 285 Inorder Successor in BST inorder
- 270 Closest Binary Search Tree Value preorder
- 272 Closest Binary Search Tree Value II inorder
- 99 Recover Binary Search Tree inorder
- 156 Binary Tree Upside Down 很少考
- 114 Flatten Binary Tree to Linked List 很少考
- 255 Verify Preorder Sequence in Binary Search Tree 很少考
- 333 Largest BST Subtree 很少考
- 222 Count Complete Tree Nodes 很少考
- 105 Construct Binary Tree from Preorder and Inorder Traversal 很少考
- 106 Construct Binary Tree from Inorder and Postorder Traversal 很少考
- 116 Populating Next Right Pointers in Each Node 重要
- 117 Populating Next Right Pointers in Each Node II 重要
- 314 Binary Tree Vertical Order Traversal 重要
- 96 Unique Binary Search Trees 重要
- 95 Unique Binary Search Trees II 很少考
- 331 Verify Preorder Serialization of a Binary Tree 很少考
- 37 Sudoku Solver
- 51 N-Queens
- 78 Subsets
- 90 Subsets II
- 77 Combinations
- 39 Combination Sum
- 40 Combination Sum II
- 216 Combination Sum III
- 377 Combination Sum IV Dynamic Programming
- 254 Factor Combinations
- 46 Permutations
- 47 Permutations II
- 31 Next Permutation String
- 60 Permutation Sequence String
- 291 Word Pattern II
- 17 Letter Combinations of a Phone Number
- 320 Generalized Abbreviation
- 93 Restore IP Addresses 很少考
- 282 Expression Add Operators
- 140 Word Break II
- 351 Android Unlock Patterns
- 679 24 Game
- 1947 Maximum Compatibility Score Sum
- 70 Climbing Stairs
- 62 Unique Paths
- 63 Unique Paths II
- 120 Triangle 很少考
- 279 Perfect Squares
- 139 Word Break
- 375 Guess Number Higher or Lower II
- 312 Burst Balloons
- 322 Coin Change
- 877 Stone Game
- 818 Race Car
- 256 Paint House
- 265 Paint House II
- 64 Minimum Path Sum
- 72 Edit Distance
- 97 Interleaving String
- 174 Dungeon Game
- 221 Maximal Square
- 85 Maximal Rectangle
- 363 Max Sum of Rectangle No Larger Than K TreeSet
- 712 Minimum ASCII Delete Sum for Two Strings
- 1143 Longest Common Subsequence
- 799 Champagne Tower
- 198 House Robber
- 213 House Robber II
- 276 Paint Fence
- 91 Decode Ways
- 10 Regular Expression Matching
- 44 Wildcard Matching
- 206 Reverse Linked List
- 141 Linked List Cycle
- 24 Swap Nodes in Pairs
- 328 Odd Even Linked List
- 92 Reverse Linked List II
- 237 Delete Node in a Linked List
- 19 Remove Nth Node From End of List
- 83 Remove Duplicates from Sorted List
- 203 Remove Linked List Elements
- 82 Remove Duplicates from Sorted List II
- 369 Plus One Linked List
- 2 Add Two Numbers
- 160 Intersection of Two Linked Lists
- 21 Merge Two Sorted Lists
- 234 Palindrome Linked List
- 143 Reorder List
- 142 Linked List Cycle II
- 148 Sort List
- 25 Reverse Nodes in k-Group
- 61 Rotate List
- 86 Partition List
- 23 Merge k Sorted Lists
- 147 Insertion Sort List
- 278 First Bad Version
- 35 Search Insert Position
- 33 Search in Rotated Sorted Array
- 81 Search in Rotated Sorted Array II
- 153 Find Minimum in Rotated Sorted Array
- 154 Find Minimum in Rotated Sorted Array II
- 162 Find Peak Element
- 374 Guess Number Higher or Lower
- 34 Find First and Last Position of Element in Sorted Array
- 349 Intersection of Two Arrays
- 350 Intersection of Two Arrays II
- 315 Count of Smaller Numbers After Self
- 300 Longest Increasing Subsequence
- 354 Russian Doll Envelopes
- 875 Koko Eating Bananas
- 48 Rotate Image
- 54 Spiral Matrix
- 59 Spiral Matrix II
- 73 Set Matrix Zeroes
- 311 Sparse Matrix Multiplication
- 329 Longest Increasing Path in a Matrix
- 378 Kth Smallest Element in a Sorted Matrix
- 74 Search a 2D Matrix
- 240 Search a 2D Matrix II
- 370 Range Addition
- 79 Word Search
- 296 Best Meeting Point
- 361 Bomb Enemy
- 317 Shortest Distance from All Buildings
- 302 Smallest Rectangle Enclosing Black Pixels
- 36 Valid Sudoku
- 37 Sudoku Solver
- 1275 Find Winner on a Tic Tac Toe Game
- 587 Erect the Fence
- 200 Number of Islands
- 286 Walls and Gates
- 130 Surrounded Regions
- 339 Nested List Weight Sum
- 364 Nested List Weight Sum II
- 127 Word Ladder
- 51 N-Queens
- 52 N-Queens II
- 126 Word Ladder II
- 155 Min Stack
- 232 Implement Queue using Stacks
- 225 Implement Stack using Queues
- 150 Evaluate Reverse Polish Notation
- 71 Simplify Path
- 388 Longest Absolute File Path
- 394 Decode String
- 224 Basic Calculator
- 227 Basic Calculator II
- 385 Mini Parser
- 84 Largest Rectangle in Histogram
- 402 Remove K Digits
- 496 Next Greater Element I
- 456 132 Pattern
- 739 Daily Temperatures
- 215 Kth Largest Element in an Array
- 347 Top K Frequent Elements
- 313 Super Ugly Number 很少考
- 373 Find K Pairs with Smallest Sums 很少考
- 218 The Skyline Problem
- 332 Reconstruct Itinerary
- 341 Flatten Nested List Iterator
- 389 Find the Difference
- 136 Single Number
- 318 Maximum Product of Word Lengths
- 393 UTF-8 Validation
- 201 Bitwise AND of Numbers Range
- 371 Sum of Two Integers emove Element
- 338 Counting Bits
- 89 Gray Code
- 268 Missing Number
- 191 Number of 1 Bits
- 190 Reverse Bits
- 137 Single Number II
- 260 Single Number III
- 207 Course Schedule
- 210 Course Schedule II
- 269 Alien Dictionary
- 384 Shuffle an Array
- 398 Random Pick Index
- 382 Linked List Random Node
- 380 Insert Delete GetRandom O(1)
- 381 Insert Delete GetRandom O(1) - Duplicates allowed
- 138 Copy List with Random Pointer
- 133 Clone Graph
- 399 Evaluate Division
- 310 Minimum Height Trees
- 743 Network Delay Time
- 149 Max Points on a Line
- 335 Self Crossing 很少考
- 356 Line Reflection 很少考
- 391 Perfect Rectangle 很少考
- 223 Rectangle Area 很少考
- 785 Is Graph Bipartite?
- 1135 Connecting Cities With Minimum Cost
- 261 Graph Valid Tree
- 323 Number of Connected Components in an Undirected Graph
- 305 Number of Islands II
- 721 Accounts Merge
- 211 Add and Search Word - Data structure design
- 208 Implement Trie (Prefix Tree)
- 212 Word Search II
- 218 The Skyline Problem
- 253 Meeting Rooms II
- 759 Employee Free Time
- 438 Find All Anagrams in a String
- 871 Minimum Number of Refueling Stops
- 359 Logger Rate Limiter
- 346 Moving Average from Data Stream Sliding Window
- 362 Design Hit Counter
- 281 Zigzag Iterator
- 284 Peeking Iterator
- 251 Flatten 2D Vector
- 288 Unique Word Abbreviation
- 170 Two Sum III - Data structure design
- 348 Design Tic-Tac-Toe
- 379 Design Phone Directory
- 353 Design Snake Game
- 146 LRU Cache
- 355 Design Twitter
- 303 Range Sum Query - Immutable
- 304 Range Sum Query 2D - Immutable
- 307 Range Sum Query - Mutable BIT & ST
- 308 Range Sum Query 2D - Mutable BIT & ST
- 460 LFU Cache
- 1166 Design File System
- 706 Design HashMap
- 1 Two Sum
- 3 Longest Substring Without Repeating Characters
- 4 Median of Two Sorted Arrays
- 5 Longest Palindromic Substring
- 7 Reverse Integer
- 8 String to Integer (atoi)
- 10 Regular Expression Matching
- 11 Container With Most Water
- 12 Integer to Roman
- 13 Roman to Integer
- 15 3Sum
- 17 Letter Combinations of a Phone Number
- 18 4Sum
- 20 Valid Parentheses
- 22 Generate Parentheses
- 23 Merge k Sorted Lists
- 26 Remove Duplicates from Sorted Array
- 27 Remove Element
- 28 Implement strStr()
- 29 Divide Two Integers
- 31 Next Permutation
- 32 Longest Valid Parentheses
- 33 Search in Rotated Sorted Array
- 34 Find First and Last Position of Element in Sorted Array
- 35 Search Insert Position
- 36 Valid Sudoku
- 37 Sudoku Solver
- 38 Count and Say
- 39 Combination Sum
- 40 Combination Sum II
- 41 First Missing Positive
- 42 Trapping Rain Water
- 43 Multiply Strings
- 44 Wildcard Matching
- 45 Jump Game II
- 46 Permutations
- 47 Permutations II
- 48 Rotate Image
- 49 Group Anagrams
- 50 Pow(x, n)
- 51 N-Queens
- 52 N-Queens II
- 53 Maximum Subarray
- 54 Spiral Matrix
- 55 Jump Game
- 56 Merge Intervals
- 57 Insert Interval
- 59 Spiral Matrix II
- 60 Permutation Sequence
- 62 Unique Paths
- 64 Minimum Path Sum
- 65 Valid Number
- 66 Plus One
- 67 Add Binary
- 68 Text Justification
- 69 Sqrt(x)
- 70 Climbing Stairs
- 71 Simplify Path
- 72 Edit Distance
- 74 Search a 2D Matrix
- 75 Sort Colors
- 76 Minimum Window Substring
- 77 Combinations
- 78 Subsets
- 79 Word Search
- 80 Remove Duplicates from Sorted Array II
- 81 Search in Rotated Sorted Array II
- 82 Remove Duplicates from Sorted List II
- 84 Largest Rectangle in Histogram
- 85 Maximal Rectangle
- 88 Merge Sorted Array
- 90 Subsets II
- 91 Decode Ways
- 96 Unique Binary Search Trees
- 98 Validate Binary Search Tree
- 101 Symmetric Tree
- 104 Maximum Depth of Binary Tree
- 108 Convert Sorted Array to Binary Search Tree
- 110 Balanced Binary Tree
- 111 Minimum Depth of Binary Tree
- 112 Path Sum
- 113 Path Sum II
- 115 Distinct Subsequences
- 116 Populating Next Right Pointers in Each Node
- 117 Populating Next Right Pointers in Each Node II
- 121 Best Time to Buy and Sell Stock
- 122 Best Time to Buy and Sell Stock II
- 123 Best Time to Buy and Sell Stock III
- 124 Binary Tree Maximum Path Sum
- 125 Valid Palindrome
- 126 Word Ladder II
- 127 Word Ladder
- 128 Longest Consecutive Sequence
- 130 Surrounded Regions
- 133 Clone Graph
- 134 Gas Station
- 138 Copy List with Random Pointer
- 139 Word Break
- 140 Word Break II
- 142 Linked List Cycle II
- 146 LRU Cache
- 149 Max Points on a Line
- 150 Evaluate Reverse Polish Notation
- 152 Maximum Product Subarray
- 153 Find Minimum in Rotated Sorted Array
- 154 Find Minimum in Rotated Sorted Array II
- 155 Min Stack
- 157 Read N Characters Given Read4
- 158 Read N Characters Given Read4 II - Call multiple times
- 161 One Edit Distance
- 162 Find Peak Element
- 163 Missing Ranges
- 168 Excel Sheet Column Title
- 171 Excel Sheet Column Number
- 173 Binary Search Tree Iterator
- 174 Dungeon Game
- 186 Reverse Words in a String II
- 188 Best Time to Buy and Sell Stock IV
- 189 Rotate Array
- 191 Number of 1 Bits
- 198 House Robber
- 200 Number of Islands
- 201 Bitwise AND of Numbers Range
- 202 Happy Number
- 204 Count Primes
- 205 Isomorphic Strings
- 207 Course Schedule
- 208 Implement Trie (Prefix Tree)
- 209 Minimum Size Subarray Sum
- 210 Course Schedule II
- 211 Add and Search Word - Data structure design
- 212 Word Search II
- 213 House Robber II
- 214 Shortest Palindrome
- 215 Kth Largest Element in an Array
- 216 Combination Sum III
- 217 Contains Duplicate
- 218 The Skyline Problem
- 219 Contains Duplicate II
- 220 Contains Duplicate III
- 221 Maximal Square
- 224 Basic Calculator
- 225 Implement Stack using Queues
- 226 Invert Binary Tree
- 227 Basic Calculator II
- 228 Summary Ranges
- 230 Kth Smallest Element in a BST
- 231 Power of Two
- 232 Implement Queue using Stacks
- 235 Lowest Common Ancestor of a Binary Search Tree
- 236 Lowest Common Ancestor of a Binary Tree
- 238 Product of Array Except Self
- 239 Sliding Window Maximum
- 240 Search a 2D Matrix II
- 241 Different Ways to Add Parentheses
- 242 Valid Anagram
- 244 Shortest Word Distance II
- 245 Shortest Word Distance III
- 249 Group Shifted Strings
- 251 Flatten 2D Vector
- 252 Meeting Rooms
- 253 Meeting Rooms II
- 254 Factor Combinations
- 256 Paint House
- 257 Binary Tree Paths
- 261 Graph Valid Tree
- 263 Ugly Number
- 264 Ugly Number II
- 265 Paint House II
- 268 Missing Number
- 269 Alien Dictionary
- 270 Closest Binary Search Tree Value
- 271 Encode and Decode Strings
- 273 Integer to English Words
- 274 H-Index
- 275 H-Index II
- 276 Paint Fence
- 277 Find the Celebrity
- 278 First Bad Version
- 279 Perfect Squares
- 280 Wiggle Sort
- 282 Expression Add Operators
- 283 Move Zeroes
- 284 Peeking Iterator
- 285 Inorder Successor in BST
- 286 Walls and Gates
- 287 Find the Duplicate Number
- 288 Unique Word Abbreviation
- 289 Game of Life
- 290 Word Pattern
- 291 Word Pattern II
- 293 Flip Game
- 294 Flip Game II
- 295 Find Median from Data Stream
- 296 Best Meeting Point
- 297 Serialize and Deserialize Binary Tree
- 298 Binary Tree Longest Consecutive Sequence
- 299 Bulls and Cows
- 300 Longest Increasing Subsequence
- 301 Remove Invalid Parentheses
- 302 Smallest Rectangle Enclosing Black Pixels
- 305 Number of Islands II
- 307 Range Sum Query - Mutable
- 308 Range Sum Query 2D - Mutable
- 309 Best Time to Buy and Sell Stock with Cooldown
- 311 Sparse Matrix Multiplication
- 312 Burst Balloons
- 314 Binary Tree Vertical Order Traversal
- 316 Remove Duplicate Letters
- 317 Shortest Distance from All Buildings
- 318 Maximum Product of Word Lengths
- 322 Coin Change
- 323 Number of Connected Components in an Undirected Graph
- 324 Wiggle Sort II
- 325 Maximum Size Subarray Sum Equals k
- 329 Longest Increasing Path in a Matrix
- 334 Increasing Triplet Subsequence
- 336 Palindrome Pairs
- 337 House Robber III
- 338 Counting Bits
- 339 Nested List Weight Sum
- 340 Longest Substring with At Most K Distinct Characters
- 341 Flatten Nested List Iterator
- 346 Moving Average from Data Stream
- 347 Top K Frequent Elements
- 348 Design Tic-Tac-Toe
- 350 Intersection of Two Arrays II
- 351 Android Unlock Patterns
- 352 Data Stream as Disjoint Intervals
- 353 Design Snake Game
- 354 Russian Doll Envelopes
- 355 Design Twitter
- 359 Logger Rate Limiter
- 361 Bomb Enemy
- 362 Design Hit Counter
- 364 Nested List Weight Sum II
- 367 Valid Perfect Square
- 374 Guess Number Higher or Lower
- 375 Guess Number Higher or Lower II
- 376 Wiggle Subsequence
- 377 Combination Sum IV
- 378 Kth Smallest Element in a Sorted Matrix
- 379 Design Phone Directory
- 380 Insert Delete GetRandom O(1)
- 381 Insert Delete GetRandom O(1) - Duplicates allowed
- 384 Shuffle an Array
- 385 Mini Parser
- 389 Find the Difference
- 394 Decode String
- 398 Random Pick Index
- 875 Koko Eating Bananas
- 621 Task Scheduler
- 743 Network Delay Time
- 785 Is Graph Bipartite?
- 739 Daily Temperatures
- 787 Cheapest Flights Within K Stops
- 438 Find All Anagrams in a String
- 721 Accounts Merge
- 706 Design HashMap
- 1143 Longest Common Subsequence
- 2400 Number of Ways to Reach a Position After Exactly k Steps
- 679 24 Game
- 1232 Check If It Is a Straight Line
- 1266 Minimum Time Visiting All Points
- 877 Stone Game
- 1401 Circle and Rectangle Overlapping
- 818 Race Car
- 587 Erect the Fence
- 799 Champagne Tower