| 001 |
Two Sum |
 |
Notes |
| 002 |
Add Two Numbers |
|
Notes |
| 003 |
Longest Substring Without Repeating Charac... |
|
Notes |
| 004 |
Median of Two Sorted Arrays |
 |
Notes |
| 005 |
Longest Palindromic Substring |
|
Notes |
| 006 |
ZigZag Conversion |
|
Notes |
| 007 |
Reverse Integer |
|
Notes |
| 008 |
String to Integer (atoi) |
|
Notes |
| 009 |
Palindrome Number |
|
Notes |
| 010 |
Regular Expression Matching |
|
Notes |
| 011 |
Container With Most Water |
|
Notes |
| 012 |
Integer to Roman |
|
Notes |
| 013 |
Roman to Integer |
|
Notes |
| 014 |
Longest Common Prefix |
|
Coming soon |
| 015 |
3Sum |
|
Notes |
| 016 |
3Sum Closest |
|
Notes |
| 017 |
Letter Combinations of a Phone Number |
|
Notes |
| 018 |
4Sum |
|
Notes |
| 019 |
Remove Nth Node From End of List |
|
Notes |
| 020 |
Valid Parentheses |
|
Notes |
| 021 |
Merge Two Sorted Lists |
|
Notes |
| 022 |
Generate Parentheses |
|
Notes |
| 023 |
Merge k Sorted Lists |
|
Notes |
| 024 |
Swap Nodes in Pairs |
|
Notes |
| 025 |
Reverse Nodes in k-Group |
|
Notes |
| 026 |
Remove Duplicates from Sorted Array |
|
Notes |
| 027 |
Remove Element |
|
Notes |
| 028 |
Implement strStr() |
|
Notes |
| 029 |
Divide Two Integers |
|
Notes |
| 030 |
Substring with Concatenation of All Words |
|
Notes |
| 031 |
Next Permutation |
|
Notes |
| 032 |
Longest Valid Parentheses |
|
Notes |
| 033 |
Search in Rotated Sorted Array |
|
Notes |
| 034 |
Search for a Range |
|
Notes |
| 035 |
Search Insert Position |
|
Notes |
| 036 |
Valid Sudoku |
|
Notes |
| 037 |
Sudoku Solver |
|
Notes |
| 038 |
Count and Say |
|
Notes |
| 039 |
Combination Sum |
|
Notes |
| 040 |
Combination Sum II |
|
Notes |
| 041 |
First Missing Positive |
|
Coming soon |
| 042 |
Trapping Rain Water |
|
Coming soon |
| 043 |
Multiply Strings |
|
Notes |
| 044 |
Wildcard Matching |
|
Coming soon |
| 045 |
Jump Game II |
|
Coming soon |
| 046 |
Permutations |
|
Notes |
| 047 |
Permutations II |
|
Notes |
| 048 |
Rotate Image |
|
Coming soon |
| 049 |
Group Anagrams |
|
Coming soon |
| 050 |
Pow(x,n) |
|
Coming soon |
| 051 |
N-Queens |
|
Coming soon |
| 052 |
N-Queens II |
|
Coming soon |
| 053 |
Maximum Subarray |
|
Coming soon |
| 054 |
Spiral Matrix |
|
Coming soon |
| 055 |
Jump Game |
|
Coming soon |
| 056 |
Merge Intervals |
|
Notes |
| 057 |
Insert Interval |
|
Coming soon |
| 058 |
Length of Last Word |
|
Coming soon |
| 059 |
Spiral Matrix II |
|
Coming soon |
| 060 |
Permutation Sequence |
|
Coming soon |
| 061 |
Rotate List |
|
Notes |
| 062 |
Unique Paths |
|
Coming soon |
| 063 |
Unique Paths II |
|
Coming soon |
| 064 |
Minimum Path Sum |
|
Coming soon |
| 065 |
Valid Number |
|
Coming soon |
| 066 |
Plus One |
|
Coming soon |
| 067 |
Add Binary |
|
Coming soon |
| 068 |
Text Justification |
|
Notes |
| 069 |
Sqrt(x) |
|
Coming soon |
| 070 |
Climbing Stairs |
|
Coming soon |
| 071 |
Simplify Path |
|
Notes |
| 072 |
Edit Distance |
|
Coming soon |
| 073 |
Set Matrix Zeroes |
|
Coming soon |
| 074 |
Search a 2D Matrix |
|
Notes |
| 075 |
Sort Colors |
|
Coming soon |
| 076 |
Minimum Window Substring |
|
Notes |
| 077 |
Combinations |
|
Coming soon |
| 078 |
Subsets |
|
Notes |
| 079 |
Word Search |
|
Notes |
| 080 |
Remove Duplicates from Sorted Array II |
|
Coming soon |
| 081 |
Search in Rotated Sorted Array II |
|
Coming soon |
| 082 |
Remove Duplicates from Sorted List II |
|
Coming soon |
| 083 |
Remove Duplicates from Sorted List |
|
Coming soon |
| 084 |
Largest Rectangle in Histogram |
|
Notes |
| 085 |
Maximal Rectangle |
|
Notes |
| 086 |
Partition List |
|
Coming soon |
| 087 |
Scramble String |
|
Notes |
| 088 |
Merge Sorted Array |
|
Coming soon |
| 089 |
Gray Code |
|
Notes |
| 090 |
Subsets II |
|
Notes |
| 091 |
Decode Ways |
|
Notes |
| 092 |
Reverse Linked List II |
|
Coming soon |
| 093 |
Restore IP Addresses |
|
Notes |
| 094 |
Binary Tree Inorder Traversal |
|
Coming soon |
| 095 |
Unique Binary Search Trees II |
|
Notes |
| 096 |
Unique Binary Search Trees |
|
Notes |
| 097 |
Interleaving String |
|
Notes |
| 098 |
Validate Binary Search Tree |
|
Notes |
| 099 |
Recover Binary Search Tree |
|
Notes |
| 100 |
Same Tree |
|
Coming soon |
| 101 |
Symmetric Tree |
|
Notes |
| 102 |
Binary Tree Level Order Traversal |
|
Coming soon |
| 103 |
Binary Tree Zigzag Level Order Traversal |
|
Notes |
| 104 |
Maximum Depth of Binary Tree |
|
Coming soon |
| 105 |
Construct Binary Tree from Preorder and In... |
|
Notes |
| 106 |
Construct Binary Tree from Inorder and Pos... |
|
Notes |
| 107 |
Binary Tree Level Order Traversal II |
|
Notes |
| 108 |
Convert Sorted Array to Binary Search Tree |
|
Notes |
| 109 |
Convert Sorted List to Binary Search Tree |
|
Notes |
| 110 |
Balanced Binary Tree |
|
Coming soon |
| 111 |
Minimum Depth of Binary Tree |
|
Coming soon |
| 112 |
Path Sum |
|
Coming soon |
| 113 |
Path Sum II |
|
Coming soon |
| 114 |
Flatten Binary Tree to Linked List |
|
Notes |
| 115 |
Distinct Subsequences |
|
Notes |
| 116 |
Populating Next Right Pointers in Each Node |
|
Coming soon |
| 117 |
Populating Next Right Pointers in Each Nod... |
|
Coming soon |
| 118 |
Pascal's Triangle |
|
Coming soon |
| 119 |
Pascal's Triangle II |
|
Coming soon |
| 120 |
Triangle |
|
Coming soon |
| 121 |
Best Time to Buy and Sell Stock |
|
Notes |
| 122 |
Best Time to Buy and Sell Stock II |
|
Notes |
| 123 |
Best Time to Buy and Sell Stock III |
|
Notes |
| 124 |
Binary Tree Maximum Path Sum |
|
Notes |
| 125 |
Valid Palindrome |
|
Coming soon |
| 126 |
Word Ladder II |
|
Coming soon |
| 127 |
Word Ladder |
|
Notes |
| 128 |
Longest Consecutive Sequence |
|
Coming soon |
| 129 |
Sum Root to Leaf Numbers |
|
Coming soon |
| 130 |
Surrounded Regions |
|
Notes |
| 131 |
Palindrome Partitioning |
|
Notes |
| 132 |
Palindrome Partitioning II |
|
Notes |
| 133 |
Clone Graph |
|
Coming soon |
| 134 |
Gas Station |
|
Notes |
| 135 |
Candy |
|
Coming soon |
| 136 |
Single Number |
|
Notes |
| 137 |
Single Number II |
|
Coming soon |
| 138 |
Copy List with Random Pointer |
|
Notes |
| 139 |
Word Break |
|
Notes |
| 140 |
Word Break II |
|
Coming soon |
| 141 |
Linked List Cycle |
|
Coming soon |
| 142 |
Linked List Cycle II |
|
Coming soon |
| 143 |
Reorder List |
|
Coming soon |
| 144 |
Binary Tree Preorder Traversal |
|
Coming soon |
| 145 |
Binary Tree Postorder Traversal |
|
Coming soon |
| 146 |
LRU Cache |
|
Notes |
| 147 |
Insertion Sort List |
|
Notes |
| 148 |
Sort List |
|
Notes |
| 149 |
Max Points on a Line |
|
Coming soon |
| 150 |
Evaluate Reverse Polish Notation |
|
Notes |
| 151 |
Reverse Words in a String |
|
Notes |
| 152 |
Maximum Product Subarray |
|
Coming soon |
| 153 |
Find Minimum in Rotated Sorted Array |
|
Notes |
| 154 |
Find Minimum in Rotated Sorted Array II |
|
Notes |
| 155 |
Min Stack |
|
Notes |
| 156 |
Binary Tree Upside Down |
|
Coming soon |
| 157 |
Read N Characters Given Read4 |
|
Coming soon |
| 158 |
Read N Characters Given Read4 II-Call mult... |
|
Coming soon |
| 159 |
Longest Substring with At Most Two Distinc... |
|
Coming soon |
| 160 |
Intersection of Two Linked Lists |
|
Coming soon |
| 161 |
One Edit Distance |
|
Coming soon |
| 162 |
Find Peak Element |
|
Coming soon |
| 163 |
Missing Ranges |
|
Coming soon |
| 164 |
Maximum Gap |
|
Notes |
| 165 |
Compare Version Numbers |
|
Coming soon |
| 166 |
Fraction to Recurring Decimal |
|
Coming soon |
| 167 |
Two Sum II-Input array is sorted |
|
Coming soon |
| 168 |
Excel Sheet Column Title |
|
Coming soon |
| 169 |
Majority Element |
|
Coming soon |
| 170 |
Two Sum III-Data structure design |
|
Coming soon |
| 171 |
Excel Sheet Column Number |
|
Coming soon |
| 172 |
Factorial Trailing Zeroes |
|
Notes |
| 173 |
Binary Search Tree Iterator |
|
Notes |
| 174 |
Dungeon Game |
|
Notes |
| 175 |
Combine Two Tables |
|
Coming soon |
| 176 |
Second Highest Salary |
|
Coming soon |
| 177 |
Nth Highest Salary |
|
Notes |
| 178 |
Rank Scores |
|
Coming soon |
| 179 |
Largest Number |
|
Notes |
| 180 |
Consecutive Numbers |
|
Notes |
| 181 |
Employees Earning More Than Their Managers |
|
Coming soon |
| 182 |
Duplicate Emails |
|
Coming soon |
| 183 |
Customers Who Never Order |
|
Coming soon |
| 184 |
Department Highest Salary |
|
Coming soon |
| 185 |
Department Top Three Salaries |
|
Coming soon |
| 186 |
Reverse Words in a String II |
|
Coming soon |
| 187 |
Repeated DNA Sequences |
|
Coming soon |
| 188 |
Best Time to Buy and Sell Stock IV |
|
Notes |
| 189 |
Rotate Array |
|
Notes |
| 190 |
Reverse Bits |
|
Notes |
| 191 |
Number of 1 Bits |
|
Notes |
| 192 |
Word Frequency |
|
Notes |
| 193 |
Valid Phone Numbers |
|
Notes |
| 194 |
Transpose File |
|
Coming soon |
| 195 |
Tenth Line |
|
Coming soon |
| 196 |
Delete Duplicate Emails |
|
Coming soon |
| 197 |
Rising Temperature |
|
Notes |
| 198 |
House Robber |
|
Notes |
| 199 |
Binary Tree Right Side View |
|
Notes |
| 200 |
Number of Islands |
|
Coming soon |
| 201 |
Bitwise AND of Numbers Range |
|
Notes |
| 202 |
Happy Number |
|
Notes |
| 203 |
Remove Linked List Elements |
|
Coming soon |
| 204 |
Count Primes |
|
Coming soon |
| 205 |
Isomorphic Strings |
|
Notes |
| 206 |
Reverse Linked List |
|
Coming soon |
| 207 |
Course Schedule |
|
Notes |
| 208 |
Implement Trie (Prefix Tree) |
|
Notes |
| 209 |
Minimum Size Subarray Sum |
|
Coming soon |
| 210 |
Course Schedule II |
|
Notes |
| 211 |
Add and Search Word-Data structure design |
|
Coming soon |
| 212 |
Word Search II |
|
Notes |
| 213 |
House Robber II |
|
Coming soon |
| 214 |
Shortest Palindrome |
|
Notes |
| 215 |
Kth Largest Element in an Array |
|
Notes |
| 216 |
Combination Sum III |
|
Notes |
| 217 |
Contains Duplicate |
|
Notes |
| 218 |
The Skyline Problem |
|
Coming soon |
| 219 |
Contains Duplicate II |
|
Notes |
| 220 |
Contains Duplicate III |
|
Notes |
| 221 |
Maximal Square |
|
Notes |
| 222 |
Count Complete Tree Nodes |
|
Notes |
| 223 |
Rectangle Area |
|
Coming soon |
| 224 |
Basic Calculator |
|
Notes |
| 225 |
Implement Stack using Queues |
|
Notes |
| 226 |
Invert Binary Tree |
|
Notes |
| 227 |
Basic Calculator II |
|
Notes |
| 228 |
Summary Ranges |
|
Notes |
| 229 |
Majority Element II |
|
Coming soon |
| 230 |
Kth Smallest Element in a BST |
|
Notes |
| 231 |
Power of Two |
|
Notes |
| 232 |
Implement Queue using Stacks |
|
Notes |
| 233 |
Number of Digit One |
|
Coming soon |
| 234 |
Palindrome Linked List |
|
Notes |
| 235 |
Lowest Common Ancestor of a Binary Search ... |
|
Notes |
| 236 |
Lowest Common Ancestor of a Binary Tree |
|
Coming soon |
| 237 |
Delete Node in a Linked List |
|
Notes |
| 238 |
Product of Array Except Self |
|
Notes |
| 239 |
Sliding Window Maximum |
|
Notes |
| 240 |
Search a 2D Matrix II |
|
Notes |
| 241 |
Different Ways to Add Parentheses |
|
Notes |
| 242 |
Valid Anagram |
|
Notes |
| 243 |
Shortest Word Distance |
|
Coming soon |
| 244 |
Shortest Word Distance II |
|
Coming soon |
| 245 |
Shortest Word Distance III |
|
Coming soon |
| 246 |
Strobogrammatic Number |
|
Coming soon |
| 247 |
Strobogrammatic Number II |
|
Coming soon |
| 248 |
Strobogrammatic Number III |
|
Coming soon |
| 249 |
Group Shifted Strings |
|
Coming soon |
| 250 |
Count Univalue Subtrees |
|
Coming soon |
| 251 |
Flatten 2D Vector |
|
Coming soon |
| 252 |
Meeting Rooms |
|
Coming soon |
| 253 |
Meeting Rooms II |
|
Coming soon |
| 254 |
Factor Combinations |
|
Coming soon |
| 255 |
Verify Preorder Sequence in Binary Search ... |
|
Coming soon |
| 256 |
Paint House |
|
Coming soon |
| 257 |
Binary Tree Paths |
|
Coming soon |
| 258 |
Add Digits |
|
Notes |
| 259 |
3Sum Smaller |
|
Coming soon |
| 260 |
Single Number III |
|
Coming soon |
| 261 |
Graph Valid Tree |
|
Coming soon |
| 262 |
Trips and Users |
|
Coming soon |
| 263 |
Ugly Number |
|
Notes |
| 264 |
Ugly Number II |
|
Notes |
| 265 |
Paint House II |
|
Coming soon |
| 266 |
Palindrome Permutation |
|
Coming soon |
| 267 |
Palindrome Permutation II |
|
Coming soon |
| 268 |
Missing Number |
|
Notes |
| 269 |
Alien Dictionary |
|
Coming soon |
| 270 |
Closest Binary Search Tree Value |
|
Coming soon |
| 271 |
Encode and Decode Strings |
|
Coming soon |
| 272 |
Closest Binary Search Tree Value II |
|
Coming soon |
| 273 |
Integer to English Words |
|
Coming soon |
| 274 |
H-Index |
|
Coming soon |
| 275 |
H-Index II |
|
Coming soon |
| 276 |
Paint Fence |
|
Coming soon |
| 277 |
Find the Celebrity |
|
Coming soon |
| 278 |
First Bad Version |
|
Notes |
| 279 |
Perfect Squares |
|
Notes |
| 280 |
Wiggle Sort |
|
Coming soon |
| 281 |
Zigzag Iterator |
|
Coming soon |
| 282 |
Expression Add Operators |
|
Coming soon |
| 283 |
Move Zeroes |
|
Notes |
| 284 |
Peeking Iterator |
|
Coming soon |
| 285 |
Inorder Successor in BST |
|
Coming soon |
| 286 |
Walls and Gates |
|
Coming soon |
| 287 |
Find the Duplicate Number |
|
Coming soon |
| 288 |
Unique Word Abbreviation |
|
Coming soon |
| 289 |
Game of Life |
|
Notes |
| 290 |
Word Pattern |
|
Notes |
| 291 |
Word Pattern II |
|
Coming soon |
| 292 |
Nim Game |
|
Notes |
| 293 |
Flip Game |
|
Coming soon |
| 294 |
Flip Game II |
|
Coming soon |
| 295 |
Find Median from Data Stream |
|
Coming soon |
| 296 |
Best Meeting Point |
|
Coming soon |
| 297 |
Serialize and Deserialize Binary Tree |
|
Coming soon |
| 298 |
Binary Tree Longest Consecutive Sequence |
|
Coming soon |
| 299 |
Bulls and Cows |
|
Coming soon |
| 300 |
Longest Increasing Subsequence |
|
Coming soon |
| 301 |
Remove Invalid Parentheses |
|
Coming soon |
| 302 |
Smallest Rectangle Enclosing Black Pixels |
|
Coming soon |
| 303 |
Range Sum Query-Immutable |
|
Coming soon |
| 304 |
Range Sum Query 2D-Immutable |
|
Coming soon |
| 305 |
Number of Islands II |
|
Coming soon |
| 306 |
Additive Number |
|
Coming soon |
| 307 |
Range Sum Query-Mutable |
|
Coming soon |
| 308 |
Range Sum Query 2D-Mutable |
|
Coming soon |
| 309 |
Best Time to Buy and Sell Stock with Cooldown |
|
Coming soon |
| 310 |
Minimum Height Trees |
|
Coming soon |
| 311 |
Sparse Matrix Multiplication |
|
Coming soon |
| 312 |
Burst Balloons |
|
Coming soon |
| 313 |
Super Ugly Number |
|
Notes |
| 314 |
Binary Tree Vertical Order Traversal |
|
Coming soon |
| 315 |
Count of Smaller Numbers After Self |
|
Notes |
| 316 |
Remove Duplicate Letters |
|
Coming soon |
| 317 |
Shortest Distance from All Buildings |
|
Coming soon |
| 318 |
Maximum Product of Word Lengths |
|
Coming soon |
| 319 |
Bulb Switcher |
|
Coming soon |
| 320 |
Generalized Abbreviation |
|
Coming soon |
| 321 |
Create Maximum Number |
|
Coming soon |
| 322 |
Coin Change |
|
Coming soon |
| 323 |
Number of Connected Components in an Undir... |
|
Coming soon |
| 324 |
Wiggle Sort II |
|
Coming soon |
| 325 |
Maximum Size Subarray Sum Equals k |
|
Coming soon |
| 326 |
Power of Three |
|
Notes |
| 327 |
Count of Range Sum |
|
Notes |
| 328 |
Odd Even Linked List |
|
Notes |
| 329 |
Longest Increasing Path in a Matrix |
|
Coming soon |
| 330 |
Patching Array |
|
Coming soon |
| 331 |
Verify Preorder Serialization of a Binary ... |
|
Coming soon |
| 332 |
Reconstruct Itinerary |
|
Coming soon |
| 333 |
Largest BST Subtree |
|
Coming soon |
| 334 |
Increasing Triplet Subsequence |
|
Coming soon |
| 335 |
Self Crossing |
|
Coming soon |
| 336 |
Palindrome Pairs |
|
Coming soon |
| 337 |
House Robber III |
|
Coming soon |
| 338 |
Counting Bits |
|
Notes |
| 339 |
Nested List Weight Sum |
|
Coming soon |
| 340 |
Longest Substring with At Most K Distinct ... |
|
Coming soon |
| 341 |
Flatten Nested List Iterator |
|
Coming soon |
| 342 |
Power of Four |
|
Coming soon |
| 343 |
Integer Break |
|
Coming soon |
| 344 |
Reverse String |
|
Coming soon |
| 345 |
Reverse Vowels of a String |
|
Coming soon |
| 346 |
Moving Average from Data Stream |
|
Coming soon |
| 347 |
Top K Frequent Elements |
|
Coming soon |
| 348 |
Design Tic-Tac-Toe |
|
Coming soon |
| 349 |
Intersection of Two Arrays |
|
Notes |
| 350 |
Intersection of Two Arrays II |
|
Coming soon |
| 351 |
Android Unlock Patterns |
|
Coming soon |
| 352 |
Data Stream as Disjoint Intervals |
|
Coming soon |
| 353 |
Design Snake Game |
|
Coming soon |
| 354 |
Russian Doll Envelopes |
|
Coming soon |
| 355 |
Design Twitter |
|
Coming soon |
| 356 |
Line Reflection |
|
Coming soon |
| 357 |
Count Numbers with Unique Digits |
|
Coming soon |
| 358 |
Rearrange String k Distance Apart |
|
Coming soon |
| 359 |
Logger Rate Limiter |
|
Coming soon |
| 360 |
Sort Transformed Array |
|
Coming soon |
| 361 |
Bomb Enemy |
|
Coming soon |
| 362 |
Design Hit Counter |
|
Coming soon |
| 363 |
Max Sum of Rectangle No Larger Than K |
|
Coming soon |
| 364 |
Nested List Weight Sum II |
|
Coming soon |
| 365 |
Water and Jug Problem |
|
Notes |
| 366 |
Find Leaves of Binary Tree |
|
Coming soon |
| 367 |
Valid Perfect Square |
|
Coming soon |
| 368 |
Largest Divisible Subset |
|
Coming soon |
| 369 |
Plus One Linked List |
|
Coming soon |
| 370 |
Range Addition |
|
Coming soon |
| 371 |
Sum of Two Integers |
|
Coming soon |
| 372 |
Super Pow |
|
Coming soon |
| 373 |
Find K Pairs with Smallest Sums |
|
Notes |
| 374 |
Guess Number Higher or Lower |
|
Coming soon |
| 375 |
Guess Number Higher or Lower II |
|
Coming soon |
| 376 |
Wiggle Subsequence |
|
Coming soon |
| 377 |
Combination Sum IV |
|
Coming soon |
| 378 |
Kth Smallest Element in a Sorted Matrix |
|
Coming soon |
| 379 |
Design Phone Directory |
|
Coming soon |
| 380 |
Insert Delete GetRandom O(1) |
|
Coming soon |
| 381 |
Insert Delete GetRandom O(1)-Duplicates al... |
|
Coming soon |
| 382 |
Linked List Random Node |
|
Coming soon |
| 383 |
Ransom Note |
|
Coming soon |
| 384 |
Shuffle an Array |
|
Coming soon |
| 385 |
Mini Parser |
|
Notes |
| 386 |
Lexicographical Numbers |
|
Coming soon |
| 387 |
First Unique Character in a String |
|
Coming soon |
| 388 |
Longest Absolute File Path |
|
Coming soon |
| 389 |
Find the Difference |
|
Coming soon |
| 390 |
Elimination Game |
|
Coming soon |
| 391 |
Perfect Rectangle |
|
Coming soon |
| 392 |
Is Subsequence |
|
Coming soon |
| 393 |
UTF-8 Validation |
|
Coming soon |
| 394 |
Decode String |
|
Coming soon |
| 395 |
Longest Substring with At Least K Repeatin... |
|
Coming soon |
| 396 |
Rotate Function |
|
Coming soon |
| 397 |
Integer Replacement |
|
Coming soon |
| 398 |
Random Pick Index |
|
Coming soon |
| 399 |
Evaluate Division |
|
Coming soon |
| 400 |
Nth Digit |
|
Coming soon |
| 401 |
Binary Watch |
|
Notes |
| 402 |
Remove K Digits |
|
Notes |
| 403 |
Frog Jump |
|
Coming soon |
| 404 |
Sum of Left Leaves |
|
Coming soon |
| 405 |
Convert a Number to Hexadecimal |
|
Coming soon |
| 406 |
Queue Reconstruction by Height |
|
Coming soon |
| 407 |
Trapping Rain Water II |
|
Coming soon |
| 408 |
Valid Word Abbreviation |
|
Coming soon |
| 409 |
Longest Palindrome |
|
Coming soon |
| 410 |
Split Array Largest Sum |
|
Coming soon |
| 411 |
Minimum Unique Word Abbreviation |
|
Coming soon |
| 412 |
Fizz Buzz |
|
Coming soon |
| 413 |
Arithmetic Slices |
|
Coming soon |
| 414 |
Third Maximum Number |
|
Coming soon |
| 415 |
Add Strings |
|
Coming soon |
| 416 |
Partition Equal Subset Sum |
|
Notes |
| 417 |
Pacific Atlantic Water Flow |
|
Coming soon |
| 418 |
Sentence Screen Fitting |
|
Coming soon |
| 419 |
Battleships in a Board |
|
Coming soon |
| 420 |
Strong Password Checker |
|
Coming soon |
| 421 |
Maximum XOR of Two Numbers in an Array |
|
Coming soon |
| 422 |
Valid Word Square |
|
Coming soon |
| 423 |
Reconstruct Original Digits from English |
|
Coming soon |
| 424 |
Longest Repeating Character Replacement |
|
Coming soon |
| 425 |
Word Squares |
|
Coming soon |
| 432 |
[All Oone Data Structure](problems/432.All-Oone-Data-Structure) |
|
Coming soon |
| 433 |
Minimum Genetic Mutation |
|
Coming soon |
| 434 |
Number of Segments in a String |
|
Notes |
| 435 |
Non-overlapping Intervals |
|
Coming soon |
| 436 |
Find Right Interval |
|
Coming soon |
| 437 |
Path Sum III |
|
Coming soon |
| 438 |
Find All Anagrams in a String |
|
Coming soon |
| 439 |
Ternary Expression Parser |
|
Coming soon |
| 440 |
K-th Smallest in Lexicographical Order |
|
Coming soon |
| 441 |
Arranging Coins |
|
Coming soon |
| 442 |
Find All Duplicates in an Array |
|
Coming soon |
| 444 |
Sequence Reconstruction |
|
Coming soon |
| 445 |
Add Two Numbers II |
|
Notes |
| 446 |
Arithmetic Slices II-Subsequence |
|
Coming soon |
| 447 |
Number of Boomerangs |
|
Coming soon |
| 448 |
Find All Numbers Disappeared in an Array |
|
Coming soon |
| 449 |
Serialize and Deserialize BST |
|
Coming soon |
| 450 |
Delete Node in a BST |
|
Coming soon |
| 451 |
Sort Characters By Frequency |
|
Notes |
| 452 |
Minimum Number of Arrows to Burst Balloons |
|
Coming soon |
| 453 |
Minimum Moves to Equal Array Elements |
|
Coming soon |
| 454 |
4Sum II |
|
Coming soon |
| 455 |
Assign Cookies |
|
Coming soon |
| 456 |
132 Pattern |
|
Coming soon |
| 457 |
Circular Array Loop |
|
Coming soon |
| 458 |
Poor Pigs |
|
Coming soon |
| 459 |
Repeated Substring Pattern |
|
Coming soon |
| 460 |
LFU Cache |
|
Coming soon |
| 461 |
Hamming Distance |
|
Coming soon |
| 462 |
Minimum Moves to Equal Array Elements II |
|
Coming soon |
| 463 |
Island Perimeter |
|
Coming soon |
| 464 |
Can I Win |
|
Coming soon |
| 465 |
Optimal Account Balancing |
|
Coming soon |
| 466 |
Count The Repetitions |
|
Coming soon |
| 467 |
Unique Substrings in Wraparound String |
|
Coming soon |
| 468 |
Validate IP Address |
|
Coming soon |
| 469 |
Convex Polygon |
|
Coming soon |
| 471 |
Encode String with Shortest Length |
|
Coming soon |
| 472 |
Concatenated Words |
|
Coming soon |
| 473 |
Matchsticks to Square |
|
Coming soon |
| 474 |
Ones and Zeroes |
|
Coming soon |
| 475 |
heaters |
|
Coming soon |
| 476 |
Number Complement |
|
Coming soon |
| 477 |
Total Hamming Distance |
|
Coming soon |
| 479 |
Largest Palindrome Product |
|
Coming soon |
| 480 |
Sliding Window Median |
|
Coming soon |
| 481 |
Magical String |
|
Coming soon |
| 482 |
License Key Formatting |
|
Coming soon |
| 483 |
Smallest Good Base |
|
Notes |
| 484 |
Find Permutation |
|
Coming soon |
| 485 |
Max Consecutive Ones |
|
Coming soon |
| 486 |
Predict the Winner |
|
Coming soon |
| 487 |
Max Consecutive Ones II |
|
Coming soon |
| 488 |
Zuma Game |
|
Coming soon |
| 490 |
The Maze |
|
Coming soon |
| 491 |
Increasing Subsequences |
|
Coming soon |
| 492 |
Construct the Rectangle |
|
Coming soon |
| 493 |
Reverse Pairs |
|
Coming soon |
| 494 |
Target Sum |
|
Coming soon |
| 495 |
Teemo Attacking |
|
Coming soon |
| 496 |
Next Greater Element I |
|
Coming soon |
| 498 |
Diagonal Traverse |
|
Notes |
| 499 |
The Maze III |
|
Coming soon |
| 500 |
Keyboard Row |
|
Coming soon |
| 501 |
Find Mode in Binary Search Tree |
|
Coming soon |
| 502 |
IPO |
|
Coming soon |
| 503 |
Next Greater Element II |
|
Notes |
| 504 |
Base 7 |
|
Coming soon |
| 505 |
The Maze II |
|
Coming soon |
| 506 |
Relative Ranks |
|
Coming soon |
| 507 |
Perfect Number |
|
Coming soon |
| 508 |
Most Frequent Subtree Sum |
|
Coming soon |
| 513 |
Find Bottom Left Tree Value |
|
Notes |
| 514 |
Freedom Trail |
|
Coming soon |
| 515 |
Find Largest Value in Each Tree Row |
|
Notes |
| 516 |
Longest Palindromic Subsequence |
|
Notes |
| 517 |
Super Washing Machines |
|
Coming soon |
| 518 |
Coin Change 2 |
|
Coming soon |
| 520 |
Detect Capital |
|
Coming soon |
| 521 |
Longest Uncommon Subsequence I |
|
Coming soon |
| 522 |
Longest Uncommon Subsequence II |
|
Coming soon |
| 523 |
Continuous Subarray Sum |
|
Coming soon |
| 524 |
Longest Word in Dictionary through Deleting |
|
Coming soon |
| 525 |
Contiguous Array |
|
Coming soon |
| 526 |
Beautiful Arrangement |
|
Coming soon |
| 527 |
Word Abbreviation |
|
Notes |
| 529 |
Minesweeper |
|
Coming soon |
| 530 |
Minimum Absolute Difference in BST |
|
Notes |
| 531 |
Lonely Pixel I |
|
Coming soon |
| 532 |
K-diff Pairs in an Array |
|
Coming soon |
| 533 |
Lonely Pixel II |
|
Coming soon |
| 534 |
Design TinyURL |
|
Coming soon |
| 535 |
Encode and Decode TinyURL |
|
Coming soon |
| 536 |
Construct Binary Tree from String |
|
Notes |
| 537 |
Complex Number Multiplication |
|
Coming soon |
| 538 |
Convert BST to Greater Tree |
|
Coming soon |
| 539 |
Minimum Time Difference |
|
Coming soon |
| 540 |
Single Element in a Sorted Array |
|
Coming soon |
| 541 |
Reverse String II |
|
Notes |
| 542 |
01 Matrix |
|
Notes |
| 543 |
Diameter of Binary Tree |
|
Coming soon |
| 544 |
Output Contest Matches |
|
Coming soon |
| 545 |
Boundary of Binary Tree |
|
Coming soon |
| 546 |
Remove Boxes |
|
Coming soon |
| 547 |
Friend Circles |
|
Coming soon |
| 548 |
Split Array with Equal Sum |
|
Coming soon |
| 549 |
Binary Tree Longest Consecutive Sequence II |
|
Coming soon |
| 551 |
Student Attendance Record I |
|
Coming soon |
| 552 |
Student Attendance Record II |
|
Coming soon |
| 553 |
Optimal Division |
|
Coming soon |
| 554 |
Brick Wall |
|
Coming soon |
| 555 |
Split Concatenated Strings |
|
Coming soon |
| 556 |
Next Greater Element III |
|
Coming soon |
| 557 |
Reverse Words in a String III |
|
Coming soon |
| 560 |
Subarray Sum Equals K |
|
Coming soon |
| 561 |
Array Partition I |
|
Coming soon |
| 562 |
Longest Line of Consecutive One in Matrix |
|
Coming soon |
| 563 |
Binary Tree Tilt |
|
Coming soon |
| 564 |
Find the Closest Palindrome |
|
Coming soon |
| 565 |
Array Nesting |
|
Coming soon |
| 566 |
Reshape the Matrix |
|
Coming soon |
| 567 |
Permutation in String |
|
Coming soon |
| 568 |
Maximum Vacation Days |
|
Coming soon |
| 569 |
Median Employee Salary |
|
Coming soon |
| 570 |
Managers with at Least 5 Direct Reports |
|
Coming soon |
| 571 |
Find Median Given Frequency of Numbers |
|
Coming soon |
| 572 |
Subtree of Another Tree |
|
Coming soon |
| 573 |
Squirrel Simulation |
|
Coming soon |
| 574 |
Winning Candidate |
|
Coming soon |
| 575 |
Distribute Candies |
|
Coming soon |
| 576 |
Out of Boundary Paths |
|
Coming soon |
| 577 |
Employee Bonus |
|
Coming soon |
| 578 |
Get Highest Answer Rate Question |
|
Coming soon |
| 579 |
Find Cumulative Salary of an Employee |
|
Coming soon |
| 580 |
Count Student Number in Departments |
|
Coming soon |
| 581 |
Shortest Unsorted Continuous Subarray |
|
Coming soon |
| 582 |
Kill Process |
|
Coming soon |
| 583 |
Delete Operation for Two Strings |
|
Coming soon |
| 584 |
Find Customer Referee |
|
Coming soon |
| 585 |
Investments in 2016 |
|
Coming soon |
| 586 |
Customer Placing the Largest Number of Orders |
|
Coming soon |
| 587 |
Erect the Fence |
|
Coming soon |
| 588 |
Design In-Memory File System |
|
Coming soon |
| 591 |
Tag Validator |
|
Coming soon |
| 592 |
Fraction Addition and Subtraction |
|
Coming soon |
| 593 |
Valid Square |
|
Coming soon |
| 594 |
Longest Harmonious Subsequence |
|
Coming soon |
| 595 |
Big Countries |
|
Coming soon |
| 596 |
Classes More Than 5 Students |
|
Coming soon |
| 597 |
Friend Requests I: Overall Acceptance Rate |
|
Coming soon |
| 598 |
Range Addition II |
|
Coming soon |
| 599 |
Minimum Index Sum of Two Lists |
|
Coming soon |
| 600 |
Non-negative Integers without Consecutive ... |
|
Coming soon |
| 601 |
Human Traffic of Stadium |
|
Coming soon |
| 602 |
Friend Requests II: Who Has the Most Friends |
|
Coming soon |
| 603 |
Consecutive Available Seats |
|
Coming soon |
| 604 |
Design Compressed String Iterator |
|
Coming soon |
| 605 |
Can Place Flowers |
|
Coming soon |
| 606 |
Construct String from Binary Tree |
|
Coming soon |
| 607 |
Sales Person |
|
Coming soon |
| 608 |
Tree Node |
|
Coming soon |
| 609 |
Find Duplicate File in System |
|
Coming soon |
| 610 |
Triangle Judgement |
|
Coming soon |
| 611 |
Valid Triangle Number |
|
Coming soon |
| 612 |
Shortest Distance in a Plane |
|
Coming soon |
| 613 |
Shortest Distance in a Line |
|
Coming soon |
| 614 |
Second Degree Follower |
|
Coming soon |
| 615 |
Average Salary: Departments VS Company |
|
Coming soon |
| 616 |
Add Bold Tag in String |
|
Coming soon |
| 617 |
Merge Two Binary Trees |
|
Coming soon |
| 618 |
Students Report By Geography |
|
Coming soon |
| 619 |
Biggest Single Number |
|
Coming soon |
| 620 |
Not Boring Movies |
|
Coming soon |
| 621 |
Task Scheduler |
|
Coming soon |
| 623 |
Add One Row to Tree |
|
Coming soon |
| 624 |
Maximum Distance in Arrays |
|
Coming soon |
| 625 |
Minimum Factorization |
|
Coming soon |
| 626 |
Exchange Seats |
|
Coming soon |
| 627 |
Swap Salary |
|
Coming soon |
| 628 |
Maximum Product of Three Numbers |
|
Coming soon |
| 629 |
K Inverse Pairs Array |
|
Coming soon |
| 630 |
Course Schedule III |
|
Coming soon |
| 631 |
Design Excel Sum Formula |
|
Coming soon |
| 632 |
Smallest Range |
|
Coming soon |
| 633 |
Sum of Square Numbers |
|
Coming soon |
| 634 |
Find the Derangement of An Array |
|
Coming soon |
| 635 |
Design Log Storage System |
|
Coming soon |
| 636 |
Exclusive Time of Functions |
|
Coming soon |
| 637 |
Average of Levels in Binary Tree |
|
Coming soon |
| 638 |
Shopping Offers |
|
Coming soon |
| 639 |
Decode Ways II |
|
Coming soon |
| 640 |
Solve the Equation |
|
Coming soon |
| 642 |
Design Search Autocomplete System |
|
Coming soon |
| 643 |
Maximum Average Subarray I |
|
Coming soon |
| 644 |
Maximum Average Subarray II |
|
Coming soon |
| 645 |
Set Mismatch |
|
Coming soon |
| 646 |
Maximum Length of Pair Chain |
|
Coming soon |
| 647 |
Palindromic Substrings |
|
Coming soon |
| 648 |
Replace Words |
|
Coming soon |
| 649 |
Dota2 Senate |
|
Coming soon |
| 650 |
2 Keys Keyboard |
|
Coming soon |
| 651 |
4 Keys Keyboard |
|
Coming soon |
| 652 |
Find Duplicate Subtrees |
|
Coming soon |
| 653 |
Two Sum IV-Input is a BST |
|
Coming soon |
| 654 |
Maximum Binary Tree |
|
Coming soon |
| 655 |
Print Binary Tree |
|
Coming soon |
| 656 |
Coin Path |
|
Coming soon |
| 657 |
Judge Route Circle |
|
Coming soon |
| 658 |
Find K Closest Elements |
|
Coming soon |
| 659 |
Split Array into Consecutive Subsequences |
|
Coming soon |
| 660 |
Remove 9 |
|
Coming soon |
| 661 |
Image Smoother |
|
Coming soon |
| 662 |
Maximum Width of Binary Tree |
|
Coming soon |
| 663 |
Equal Tree Partition |
|
Coming soon |
| 664 |
Strange Printer |
|
Coming soon |
| 665 |
Non-decreasing Array |
|
Coming soon |
| 666 |
Path Sum IV |
|
Coming soon |
| 667 |
Beautiful Arrangement II |
|
Coming soon |
| 668 |
Kth Smallest Number in Multiplication Table |
|
Coming soon |
| 669 |
Trim a Binary Search Tree |
|
Coming soon |
| 670 |
Maximum Swap |
|
Coming soon |
| 671 |
Second Minimum Node In a Binary Tree |
|
Coming soon |
| 672 |
Bulb Switcher II |
|
Coming soon |
| 673 |
Number of Longest Increasing Subsequence |
|
Coming soon |
| 674 |
Longest Continuous Increasing Subsequence |
|
Coming soon |
| 675 |
Cut Off Trees for Golf Event |
|
Coming soon |
| 676 |
Implement Magic Dictionary |
|
Coming soon |
| 677 |
Map Sum Pairs |
|
Coming soon |
| 678 |
Valid Parenthesis String |
|
Coming soon |
| 679 |
24 Game |
|
Coming soon |
| 680 |
Valid Palindrome II |
|
Coming soon |
| 686 |
Repeated String Match |
|
Coming soon |
| 688 |
Knight Probability in Chessboard |
|
Coming soon |
| 689 |
Maximum Sum of 3 Non-Overlapping Subarrays |
|
Coming soon |
| 693 |
Binary Number with Alternating Bits |
|
Coming soon |
| 696 |
Count Binary Substrings |
|
Coming soon |
| 697 |
Degree of an Array |
|
Coming soon |
| 698 |
Partition to K Equal Sum Subsets |
|
Coming soon |
| 699 |
Falling Squares |
|
Coming soon |
| 740 |
Delete and Earn |
|
Coming soon |
| 746 |
Min Cost Climbing Stairs |
|
Coming soon |
| 748 |
Shortest Completing Word |
|
Coming soon |
| 749 |
Contain Virus |
|
Coming soon |
| 750 |
Number Of Corner Rectangles |
|
Coming soon |
| 756 |
Pyramid Transition Matrix |
|
Coming soon |
| 758 |
Bold Words in String |
|
Coming soon |
| 759 |
Employee Free Time |
|
Coming soon |
| 760 |
Find Anagram Mappings |
|
Coming soon |
| 761 |
Special Binary String |
|
Coming soon |
| 766 |
Toeplitz Matrix |
|
Coming soon |
| 767 |
Reorganize String |
|
Coming soon |
| 768 |
Max Chunks To Make Sorted II |
|
Coming soon |
| 769 |
Max Chunks To Make Sorted |
|
Coming soon |
| 770 |
Basic Calculator IV |
|
Coming soon |
| 771 |
Jewels and Stones |
|
Coming soon |
| 773 |
Sliding Puzzle |
|
Coming soon |
| 774 |
Minimize Max Distance to Gas Station |
|
Coming soon |
| 775 |
Global and Local Inversions |
|
Coming soon |
| 777 |
Swap Adjacent in LR String |
|
Coming soon |
| 778 |
Swim in Rising Water |
|
Coming soon |
| 779 |
K-th Symbol in Grammar |
|
Coming soon |
| 780 |
Reaching Points |
|
Coming soon |
| 781 |
Rabbits in Forest |
|
Coming soon |
| 782 |
Transform to Chessboard |
|
Coming soon |
| 783 |
Minimum Distance Between BST Nodes |
|
Coming soon |
| 784 |
Letter Case Permutation |
|
Coming soon |
| 785 |
Is Graph Bipartite |
|
Coming soon |
| 786 |
K-th Smallest Prime Fraction |
|
Coming soon |
| 787 |
Cheapest Flights Within K Stops |
|
Coming soon |
| 788 |
Rotated Digits |
|
Coming soon |
| 789 |
Escape The Ghosts |
|
Coming soon |
| 790 |
Domino and Tromino Tiling |
|
Coming soon |
| 791 |
Custom Sort String |
|
Coming soon |
| 796 |
Rotate String |
|
Notes |
| 797 |
All Paths From Source to Target |
|
Coming soon |
| 798 |
Smallest Rotation with Highest Score |
|
Coming soon |
| 799 |
Champagne Tower |
|
Coming soon |
| 800 |
Similar RGB Color |
|
Coming soon |
| 801 |
Minimum Swaps To Make Sequences Increasing |
|
Coming soon |
| 802 |
Find Eventual Safe States |
|
Coming soon |
| 803 |
Bricks Falling When Hit |
|
Coming soon |
