| 1 |
Range Sum Query 2D-Immutable |
| 2 |
Combination Sum III |
| 3 |
Divide Two Integers |
| 4 |
Ugly Number II |
| 5 |
Set Matrix Zeroes |
| 6 |
Container With Most Water |
| 7 |
Spiral Matrix |
| 8 |
Rabbits in Forest |
| 9 |
Binary Tree Vertical Order Traversal |
| 10 |
Basic Calculator II |
| 11 |
Corporate Flight Bookings |
| 12 |
Custom Sort String |
| 13 |
Minimum Moves to Equal Array Elements II |
| 14 |
Rotate List |
| 15 |
Flatten Nested List Iterator |
| 16 |
Minimum Number of Arrows to Burst Balloons |
| 17 |
Count Complete Tree Nodes |
| 18 |
Search in Rotated Sorted Array |
| 19 |
Subarray Product Less Than K |
| 20 |
Unique Binary Search Trees |
| 21 |
Shuffle an Array |
| 22 |
Permutation in String |
| 23 |
Flatten a Multilevel Doubly Linked List |
| 24 |
Search in Rotated Sorted Array II |
| 25 |
Pour Water |
| 26 |
Find Leaves of Binary Tree |
| 27 |
Majority Element II |
| 28 |
Course Schedule II |
| 29 |
Design Circular Queue |
| 30 |
Battleships in a board |
| 31 |
Next Greater Element III |
| 32 |
Linked List Components |
| 33 |
Multiply Strings |
| 34 |
Convert Binary Search Tree to Sorted Doubly Linked List |
| 35 |
Add One Row to Tree |
| 36 |
Binary Tree Pruning |
| 37 |
Word Break |
| 38 |
Interval List Intersections |
| 39 |
Pow |
| 40 |
Daily Temperatures |
| 41 |
Implement Rand10() Using Rand7() |
| 42 |
Palindromic Substrings |
| 43 |
Reverse Substrings Between Each Pair of Parentheses |
| 44 |
Design File System |
| 45 |
Lowest Common Ancestor of Deepest Leaves |
| 46 |
Grumpy Bookstore Owner |
| 47 |
Remove Duplicates From Sorted Array II |
| 48 |
Validate IP Address |
| 49 |
Boats to Save People |
| 50 |
Ternary Expression Parser |
| 51 |
Find Peak Element |
| 52 |
Design Tic-Tac-Toe |
| 53 |
Keys and Rooms |
| 54 |
Counting Bits |
| 55 |
Split Linked List into Parts |
| 56 |
Number of Connected Components in an Undirected Graph |
| 57 |
Task Scheduler |
| 58 |
Online Election |
| 59 |
Maximum Width Ramp |
| 60 |
Time Based Key-Value Store |
| 61 |
Sum Root to Leaf Numbers |
| 62 |
Kth Largest Element in an Array |
| 63 |
Bitwise AND of Numbers Range |
| 64 |
Binary Tree Longest Consecutive Sequence |
| 65 |
Largest BST Subtree |
| 66 |
Populating Next Right Pointers in Each Node II |
| 67 |
Online Stock Span |
| 68 |
Combination Sum II |
| 69 |
Insert Into a Cyclic Sorted List |
| 70 |
Reconstruct Itinerary |
| 71 |
Partition Labels |
| 72 |
Distribute Coins in Binary Tree |
| 73 |
Longest Palindromic Substring |
| 74 |
Simplify Path |
| 75 |
Zigzag Iterator |
| 76 |
Max Chunks To Make Sorted |
| 77 |
Is Subsequence |
| 78 |
Reverse Linked List II |
| 79 |
Complex Number Multiplication |
| 80 |
Maximum Binary Tree |
| 81 |
Meeting Rooms II |
| 82 |
Fraction to Recurring Decimal |
| 83 |
Add and Search Word - Data structure design |
| 84 |
Super Ugly Number |
| 85 |
Escape The Ghosts |
| 86 |
Max Increase to Keep City Skyline |
| 87 |
Minimum Path Sum |
| 88 |
Valid Tic-Tac-Toe State |
| 89 |
Shortest Completing Word |
| 90 |
01 Matrix |
| 91 |
As Far from Land as Possible |
| 92 |
Number of Matching Subsequence |
| 93 |
Car Pooling |
| 94 |
Generate Parentheses |
| 95 |
Exclusive Time of Functions |
| 96 |
Sort Characters By Frequency |
| 97 |
Max Consecutives Ones II |
| 98 |
Number of Islands |
| 99 |
Reverse Words in a String II |
| 100 |
Binary Tree Upside Down |
| 101 |
Count Univalue Subtrees |
| 102 |
Split BST |
| 103 |
All Possible Full Binary Trees |
| 104 |
Convert Sorted List to Binary Search Tree |
| 105 |
Word Search |
| 106 |
Add Two Numbers II |
| 107 |
Sort List |
| 108 |
Gray Code |
| 109 |
Rotate Function |
| 110 |
Bulb Switcher |
| 111 |
Implement Trie (Prefix Tree) |
| 112 |
Contains Duplicate III |
| 113 |
Copy List with Random Pointer |
| 114 |
Design Hit Counter |
| 115 |
Medium |
| 116 |
Binary Tree Inorder Traversal |
| 117 |
Maximum Product Subarray |
| 118 |
Prison Cells After N Days |
| 119 |
Evaluate Reverse Polish Notation |
| 120 |
H-Index |
| 121 |
Mini Parser |
| 122 |
Line Reflection |
| 123 |
Linked List Cycle II |
| 124 |
Minimum Size Subarray Sum |
| 125 |
Next Greater Element II |
| 126 |
Decode String |
| 127 |
Unique Paths II |
| 128 |
Shifting Letters |
| 129 |
Subarray Sum Equals K |
| 130 |
Graph Valid Tree |
| 131 |
Flatten Binary Tree to Linked List |
| 132 |
Top K Frequent Elements |
| 133 |
Find First and Last Position of Element in Sorted Array |
| 134 |
Broken Calculator |
| 135 |
Design Twitter |
| 136 |
Nested List Weight Sum II |
| 137 |
Permutations II |
| 138 |
Sort An Array |
| 139 |
Construct Quad Tree |
| 140 |
Game of Life |
| 141 |
Remove Nth Node From End of List |
| 142 |
Random Pick Index |
| 143 |
My Calendar II |
| 144 |
Search for a range |
| 145 |
Binary Tree Right Side View |
| 146 |
Longest Substring Without Repeating Characters |
| 147 |
Single Number III |
| 148 |
Candy Crush |
| 149 |
Web Crawler |
| 150 |
Lonely Pixel I |
| 151 |
Reorganize String |
| 152 |
Insertion Sort List |
| 153 |
Peeking Iterator |
| 154 |
Reorder List |
| 155 |
Unique Paths |
| 156 |
Reconstruct Original Digits from English |
| 157 |
Walls and Gates |
| 158 |
Total Hamming Distance |
| 159 |
Rectangle Area |
| 160 |
Binary Search Tree to Greater Sum Tree |
| 161 |
Longest Absolute File Path |
| 162 |
Single Element in a Sorted Array |
| 163 |
Binary Search Tree Iterator |
| 164 |
Find K Closest Elements |
| 165 |
Rotate Image |
| 166 |
Next Permutation |
| 167 |
Design Phone Directory |
| 168 |
Jump Game |
| 169 |
H-Index II |
| 170 |
Subarray Sums Divisible by K |
| 171 |
Kill Process |
| 172 |
Boundary of Binary Tree |
| 173 |
Course Schedule |
| 174 |
Insert Delete GetRandom O(1) |
| 175 |
Coin Change 2 |
| 176 |
Find Duplicate Subtrees |
| 177 |
Letter Tiles Possibilities |
| 178 |
Palindrome Partitioning |
| 179 |
Longest Palindromic Subsequence |
| 180 |
Expressive Words |
| 181 |
Linked List Random Node |
| 182 |
Find Minimum in Rotated Sorted Array |
| 183 |
3Sum Closest |
| 184 |
Permutations |
| 185 |
Next Greater Node In Linked List |
| 186 |
Map Sum Pairs |
| 187 |
Minimum Genetic Mutation |
| 188 |
Maximum Binary Tree II |
| 189 |
Delete Operation for Two Strings |
| 190 |
Inorder Successor in BST |
| 191 |
Array Nesting |
| 192 |
Output Contest Matches |
| 193 |
Serialize and Deserialize BST |
| 194 |
Find the duplicate number |
| 195 |
Single Number II |
| 196 |
Statistics from a Large Sample |
| 197 |
Accounts Merge |
| 198 |
Reverse Words in a String |
| 199 |
Find Duplicate File in System |
| 200 |
Delete Node in a BST |
| 201 |
Is Graph Bipartite |
| 202 |
Minesweeper |
| 203 |
Remove K Digits |
| 204 |
Next Closest Time |
| 205 |
Self Dividing Numbers |
| 206 |
Replace Words |
| 207 |
Longest Increasing Subsequence |
| 208 |
Find Right Interval |
| 209 |
Non Overlapping Intervals |
| 210 |
Range Addition |
| 211 |
3Sum Smaller |
| 212 |
Shortest Way to Form String |
| 213 |
Missing Element in Sorted Array |
| 214 |
Insufficient Nodes in Root to Leaf Paths |
| 215 |
Maximum Width of Binary Tree |
| 216 |
Product of Array Except self |
| 217 |
Sort Colors |
| 218 |
Arithmetic Slices |
| 219 |
Number of Dice Rolls With Target Sum |
| 220 |
Perfect Squares |
| 221 |
Search a 2D Matrix |
| 222 |
Satisfisbility of Equality Equations |
| 223 |
Maximum Length of Pair Chain |
| 224 |
Queue Reconstruction By Height |
| 225 |
Bulls and Cows |
| 226 |
Unique Word Abbrevation |
| 227 |
Range Sum Query - Mutable |
| 228 |
Delete Nodes And Return Forest |
| 229 |
4Sum |
| 230 |
Missing Ranges |
| 231 |
Sentence Similarity II |
| 232 |
Evaluate Division |
| 233 |
Find K Pairs with Smallest Sums |
| 234 |
Partition List |
| 235 |
Encode and Decode Strings |
| 236 |
Decrease Elements To Make Array Zigzag |
| 237 |
Maximum Level Sum of a Binary Tree |
| 238 |
All Nodes Distance K in Binary Tree |
| 239 |
Design Circular Deque |
| 240 |
Design Log Storage System |
| 241 |
Decode Ways |
| 242 |
Sort Transformed Array |
| 243 |
Wiggle Sort |
| 244 |
Path Sum II |
| 245 |
Subsets |
| 246 |
Increasing Subsequences |
| 247 |
Number of Distinct Islands |
| 248 |
Add Two Numbers |
| 249 |
Fruit Into Baskets |
| 250 |
Lowest Common Ancestor of a Binary Tree |
| 251 |
Complete Binary Tree Insertor |
| 252 |
Clone Graph |
| 253 |
Binary Tree Preorder Traversal |
| 254 |
Random Pick With Weight |
| 255 |
Vertical Order Traversal Of Binary Tree |
| 256 |
Remove Duplicates from Sorted List II |
| 257 |
Search in a Sorted Array of Unknown Size |
| 258 |
Rectangle Overlap |
| 259 |
Analyze User Website Visit Pattern |
| 260 |
Combination Sum |
| 261 |
Solve the Equation |
| 262 |
The Earliest Moment When Everyone Become Friends |
| 263 |
Verify Preorder Serialization of a Binary Tree |
| 264 |
Optimal Division |
| 265 |
Score of Parentheses |
| 266 |
Merge Intervals |
| 267 |
Kth Smallest Element in a BST |
| 268 |
Coin Change |
| 269 |
Find the Celebrity |
| 270 |
Array Circular Loop |
| 271 |
Snapshot Array |
| 272 |
Top K Frequent Words |
| 273 |
Asteroid Collision |
| 274 |
Encode and Decode TinyURL |
| 275 |
Insert into a Binary Search Tree |
| 276 |
Word Ladder |
| 277 |
Inorder Successor in BST II |
| 278 |
Find and Replace Pattern |
| 279 |
Number of Longest Increasing Subsequence |
| 280 |
Remove Comments |
| 281 |
Pancake Sorting |
| 282 |
Maximum Size Subarray Sum Equals k |
| 283 |
3Sum |
| 284 |
Valid Triangle Number |
| 285 |
Kth Smallest Element in a Sorted Matrix |
| 286 |
String to Integer(atoi) |
| 287 |
All Paths From Source to Target |
| 288 |
Binary Tree Longest Consecutive Sequence II |
| 289 |
Friend Circles |
| 290 |
Swap Nodes in Pair |
| 291 |
Plus One Linked List |
| 292 |
Teemo Attacking |
| 293 |
Compare Version Numbers |
| 294 |
Smallest String Starting From Leaf |
| 295 |
Count Numbers With Unique Digits |
| 296 |
Uncrossed Lines |
| 297 |
Vowel Spellchecker |
| 298 |
Contiguous Array |
| 299 |
Longest Well-Performing Interval |
| 300 |
Find Bottom Left Tree Value |
| 301 |
Score After Flipping Matrix |
| 302 |
4 Sum II |
| 303 |
Most Frequent Subtree Sum |
| 304 |
Combinations |
| 305 |
RLE Iterator |
| 306 |
Spiral Matrix II |
| 307 |
Find Largest Value in Tree Row |
| 308 |
Minimum Time Difference |
| 309 |
Find all Duplicates in an Array |
| 310 |
Diagonal Traverse |
| 311 |
Print Binary Tree |
| 312 |
Masking Personal Information |
| 313 |
Summary Ranges |
| 314 |
Letter Combinations of a Phone Number |
| 315 |
Odd Even Linked Lists |
| 316 |
Find K-Length Substrings With No Repeated Characters |
| 317 |
ZigZag Conversion |
| 318 |
Water & Jug Problem |
| 319 |
Find and Replace in String |
| 320 |
Construct Binary Tree from Inorder and Postorder Traversal |
| 321 |
Flatten 2D Vector |
| 322 |
Hand of Straights |
| 323 |
Maximum Average Subtree |
| 324 |
Repeated DNA Sequences |
| 325 |
Integer To Roman |
| 326 |
My Calendar I |
| 327 |
Longest Line of Consecutive One in Matrix |
| 328 |
Group Shifted Strings |
| 329 |
Reverse Nodes in k-group |
| 330 |
One Edit Distance |
| 331 |
Add Bold Tag in String |
| 332 |
Open The Lock |
| 333 |
Target Sum |