### LinkedIn(39)
* 1 Two Sum 23.0% Easy
* 21 Merge Two Sorted Lists 35.4% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 33 Search in Rotated Sorted Array 30.2% Hard
* 34 Search for a Range 29.1% Medium
* 46 Permutations 35.7% Medium
* 47 Permutations II 28.0% Medium
* 50 Pow(x, n) 27.9% Medium
* 53 Maximum Subarray 36.6% Medium
* 56 Merge Intervals 25.3% Hard
* 57 Insert Interval 23.8% Hard
* 65 Valid Number 12.1% Hard
* 68 Text Justification 16.1% Hard
* 76 Minimum Window Substring 21.2% Hard
* 101 Symmetric Tree 33.9% Easy
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 103 Binary Tree Zigzag Level Order Traversal 28.6% Medium
* 104 Maximum Depth of Binary Tree 47.8% Easy
* 127 Word Ladder 19.6% Medium
* 149 Max Points on a Line 14.2% Hard
* 150 Evaluate Reverse Polish Notation 23.5% Medium
* 152 Maximum Product Subarray 22.1% Medium
* 156 Binary Tree Upside Down 38.3% Medium
* 170 Two Sum III – Data structure design 24.0% Easy
* 173 Binary Search Tree Iterator 34.5% Medium
* 187 Repeated DNA Sequences 25.2% Medium
* 198 House Robber 34.2% Easy
* 205 Isomorphic Strings 29.5% Easy
* 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium
* 238 Product of Array Except Self 42.6% Medium
* 243 Shortest Word Distance 46.3% Easy
* 244 Shortest Word Distance II 35.3% Medium
* 245 Shortest Word Distance III 46.0% Medium
* 254 Factor Combinations 34.7% Medium
* 256 Paint House 42.6% Medium
* 277 Find the Celebrity 35.1% Medium
* 297 Serialize and Deserialize Binary Tree 27.8% Hard
* 311 Sparse Matrix Multiplication 47.2% Medium
* 339 Nested List Weight Sum 54.7% Easy*
### Google(90)
* Median of Two Sorted Arrays 18.6% Hard
* 10 Regular Expression Matching 22.0% Hard
* 17 Letter Combinations of a Phone Number 28.6% Medium
* 20 Valid Parentheses 29.3% Easy
* 22 Generate Parentheses 36.9% Medium
* 23 Merge k Sorted Lists 23.3% Hard
* 31 Next Permutation 26.5% Medium
* 42 Trapping Rain Water 32.2% Hard
* 44 Wildcard Matching 17.4% Hard
* 50 Pow(x, n) 27.9% Medium
* 54 Spiral Matrix 22.5% Medium
* 56 Merge Intervals 25.3% Hard
* 57 Insert Interval 23.8% Hard
* 66 Plus One 33.5% Easy
* 128 Longest Consecutive Sequence 32.1% Hard
* 133 Clone Graph 24.9% Medium
* 139 Word Break 25.2% Medium
* 140 Word Break II 19.7% Hard
* 146 LRU Cache 15.8% Hard
* 155 Min Stack 22.0% Easy
* 158 Read N Characters Given Read4 II – Call multiple times 23.4% Hard
* 159 Longest Substring with At Most Two Distinct Characters 34.7% Hard
* 162 Find Peak Element 33.0% Medium
* 163 Missing Ranges 29.2% Medium
* 166 Fraction to Recurring Decimal 15.1% Medium
* 173 Binary Search Tree Iterator 34.5% Medium
* 200 Number of Islands 27.6% Medium
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 212 Word Search II 19.3% Hard
* 214 Shortest Palindrome 19.7% Hard
* 218 The Skyline Problem 22.0% Hard
* 224 Basic Calculator 22.1% Hard
* 228 Summary Ranges 24.1% Medium
* 230 Kth Smallest Element in a BST 37.6% Medium
* 231 Power of Two 36.4% Easy
* 239 Sliding Window Maximum 27.3% Hard
* 240 Search a 2D Matrix II 34.4% Medium
* 246 Strobogrammatic Number 36.3% Easy
* 247 Strobogrammatic Number II 34.1% Medium
* 249 Group Shifted Strings 31.3% Easy
* 251 Flatten 2D Vector 33.8% Medium
* 253 Meeting Rooms II 34.6% Medium
* 257 Binary Tree Paths 28.4% Easy
* 259 3Sum Smaller 38.2% Medium
* 261 Graph Valid Tree 32.5% Medium
* 266 Palindrome Permutation 50.4% Easy
* 269 Alien Dictionary 22.9% Hard
* 270 Closest Binary Search Tree Value 34.3% Easy
* 271 Encode and Decode Strings 27.1% Medium
* 272 Closest Binary Search Tree Value II 33.1% Hard
* 274 H-Index 29.3% Medium
* 276 Paint Fence 30.9% Easy
* 279 Perfect Squares 32.5% Medium
* 280 Wiggle Sort 49.5% Medium
* 281 Zigzag Iterator 42.8% Medium
* 282 Expression Add Operators 24.8% Hard
* 284 Peeking Iterator 33.5% Medium
* 286 Walls and Gates 37.2% Medium
* 288 Unique Word Abbreviation 15.7% Easy
* 289 Game of Life 34.2% Medium
* 293 Flip Game 49.5% Easy
* 294 Flip Game II 41.3% Medium
* 295 Find Median from Data Stream 22.0% Hard
* 297 Serialize and Deserialize Binary Tree 27.8% Hard
* 298 Binary Tree Longest Consecutive Sequence 36.9% Medium
* 302 Smallest Rectangle Enclosing Black Pixels 39.0% Hard
* 305 Number of Islands II 34.0% Hard
* 308 Range Sum Query 2D – Mutable 21.6% Hard
* 309 Best Time to Buy and Sell Stock with Cooldown 36.6% Medium
* 310 Minimum Height Trees 26.6% Medium
* 312 Burst Balloons 36.4% Hard
* 313 Super Ugly Number 33.9% Medium
* 314 Binary Tree Vertical Order Traversal 30.3% Medium
* 315 Count of Smaller Numbers After Self 30.1% Hard
* 316 Remove Duplicate Letters 24.9% Hard
* 317 Shortest Distance from All Buildings 31.1% Hard
* 318 Maximum Product of Word Lengths 39.6% Medium
* 320 Generalized Abbreviation 40.8% Medium
* 321 Create Maximum Number 20.8% Hard
* 323 Number of Connected Components in an Undirected Graph 42.8% Medium
* 324 Wiggle Sort II 22.1% Medium
* 326 Power of Three 36.5% Easy
* 327 Count of Range Sum 25.9% Hard
* 329 Longest Increasing Path in a Matrix 31.2% Hard
* 330 Patching Array 28.9% Medium
* 331 Verify Preorder Serialization of a Binary Tree 31.7% Medium
* 332 Reconstruct Itinerary 23.8% Medium
* 336 Palindrome Pairs 19.5% Hard
* 340 Longest Substring with At Most K Distinct Characters 37.2% Hard
* 341 Flatten Nested List Iterator 19.8% Medium*
### Uber(42)
* Two Sum 23.0% Easy
* 8 String to Integer (atoi) 13.5% Easy
* 10 Regular Expression Matching 22.0% Hard
* 13 Roman to Integer 39.2% Easy
* 17 Letter Combinations of a Phone Number 28.6% Medium
* 22 Generate Parentheses 36.9% Medium
* 23 Merge k Sorted Lists 23.3% Hard
* 24 Swap Nodes in Pairs 35.1% Easy
* 33 Search in Rotated Sorted Array 30.2% Hard
* 36 Valid Sudoku 30.5% Easy
* 37 Sudoku Solver 24.8% Hard
* 39 Combination Sum 30.9% Medium
* 49 Group Anagrams 27.4% Medium
* 54 Spiral Matrix 22.5% Medium
* 76 Minimum Window Substring 21.2% Hard
* 78 Subsets 31.3% Medium
* 91 Decode Ways 17.5% Medium
* 104 Maximum Depth of Binary Tree 47.8% Easy
* 121 Best Time to Buy and Sell Stock 36.0% Easy
* 125 Valid Palindrome 23.8% Easy
* 133 Clone Graph 24.9% Medium
* 138 Copy List with Random Pointer 26.1% Hard
* 139 Word Break 25.2% Medium
* 140 Word Break II 19.7% Hard
* 146 LRU Cache 15.8% Hard
* 155 Min Stack 22.0% Easy
* 161 One Edit Distance 28.4% Medium
* 171 Excel Sheet Column Number 41.5% Easy
* 186 Reverse Words in a String II 29.1% Medium
* 202 Happy Number 36.5% Easy
* 206 Reverse Linked List 39.4% Easy
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 230 Kth Smallest Element in a BST 37.6% Medium
* 242 Valid Anagram 41.7% Easy
* 249 Group Shifted Strings 31.3% Easy
* 254 Factor Combinations 34.7% Medium
* 262 Trips and Users 16.1% Hard
* 266 Palindrome Permutation 50.4% Easy
* 290 Word Pattern 29.0% Easy
* 291 Word Pattern II 34.8% Hard
* 297 Serialize and Deserialize Binary Tree 27.8% Har
* 337 House Robber III 37.0% Medium*
### Airbnb(20)
* 1 Two Sum 23.0% Easy
* 2 Add Two Numbers 23.0% Medium
* 10 Regular Expression Matching 22.0% Hard
* 20 Valid Parentheses 29.3% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 68 Text Justification 16.1% Hard
* 108 Convert Sorted Array to Binary Search Tree 37.2% Medium
* 136 Single Number 49.6% Medium
* 160 Intersection of Two Linked Lists 30.2% Easy
* 190 Reverse Bits 29.3% Easy
* 198 House Robber 34.2% Easy
* 202 Happy Number 36.5% Easy
* 212 Word Search II 19.3% Hard
* 217 Contains Duplicate 41.1% Easy
* 219 Contains Duplicate II 29.9% Easy
* 220 Contains Duplicate III 18.5% Medium
* 221 Maximal Square 23.5% Medium
* 251 Flatten 2D Vector 33.8% Medium
* 269 Alien Dictionary 22.9% Hard
* 336 Palindrome Pairs 19.5% Hard*
### Facebook(79)
* Two Sum 23.0% Easy
* 10 Regular Expression Matching 22.0% Hard
* 13 Roman to Integer 39.2% Easy
* 15 3Sum 18.8% Medium
* 17 Letter Combinations of a Phone Number 28.6% Medium
* 20 Valid Parentheses 29.3% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 25 Reverse Nodes in k-Group 27.5% Hard
* 26 Remove Duplicates from Sorted Array 33.4% Easy
* 28 Implement strStr() 24.8% Easy
* 33 Search in Rotated Sorted Array 30.2% Hard
* 38 Count and Say 28.9% Easy
* 43 Multiply Strings 23.4% Medium
* 44 Wildcard Matching 17.4% Hard
* 49 Group Anagrams 27.4% Medium
* 50 Pow(x, n) 27.9% Medium
* 56 Merge Intervals 25.3% Hard
* 57 Insert Interval 23.8% Hard
* 67 Add Binary 27.4% Easy
* 69 Sqrt(x) 25.2% Medium
* 71 Simplify Path 21.9% Medium
* 75 Sort Colors 34.7% Medium
* 76 Minimum Window Substring 21.2% Hard
* 78 Subsets 31.3% Medium
* 79 Word Search 22.9% Medium
* 80 Remove Duplicates from Sorted Array II 32.7% Medium
* 85 Maximal Rectangle 23.4% Hard
* 88 Merge Sorted Array 30.0% Easy
* 90 Subsets II 30.5% Medium
* 91 Decode Ways 17.5% Medium
* 98 Validate Binary Search Tree 20.9% Medium
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 117 Populating Next Right Pointers in Each Node II 32.8% Hard
* 121 Best Time to Buy and Sell Stock 36.0% Easy
* 125 Valid Palindrome 23.8% Easy
* 127 Word Ladder 19.6% Medium
* 128 Longest Consecutive Sequence 32.1% Hard
* 133 Clone Graph 24.9% Medium
* 139 Word Break 25.2% Medium
* 146 LRU Cache 15.8% Hard
* 157 Read N Characters Given Read4 29.5% Easy
* 158 Read N Characters Given Read4 II – Call multiple times 23.4% Hard
* 161 One Edit Distance 28.4% Medium
* 168 Excel Sheet Column Title 21.6% Easy
* 173 Binary Search Tree Iterator 34.5% Medium
* 200 Number of Islands 27.6% Medium
* 206 Reverse Linked List 39.4% Easy
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 209 Minimum Size Subarray Sum 26.8% Medium
* 210 Course Schedule II 21.0% Medium
* 211 Add and Search Word – Data structure design 20.2% Medium
* 215 Kth Largest Element in an Array 33.1% Medium
* 218 The Skyline Problem 22.0% Hard
* 221 Maximal Square 23.5% Medium
* 234 Palindrome Linked List 28.0% Easy
* 235 Lowest Common Ancestor of a Binary Search Tree 37.7% Easy
* 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium
* 238 Product of Array Except Self 42.6% Medium
* 252 Meeting Rooms 41.6% Easy
* 253 Meeting Rooms II 34.6% Medium
* 257 Binary Tree Paths 28.4% Easy
* 261 Graph Valid Tree 32.5% Medium
* 265 Paint House II 35.6% Hard
* 269 Alien Dictionary 22.9% Hard
* 273 Integer to English Words 18.7% Hard
* 274 H-Index 29.3% Medium
* 275 H-Index II 32.5% Medium
* 277 Find the Celebrity 35.1% Medium
* 278 First Bad Version 22.4% Easy
* 282 Expression Add Operators 24.8% Hard
* 283 Move Zeroes 44.0% Easy
* 285 Inorder Successor in BST 35.6% Medium
* 286 Walls and Gates 37.2% Medium
* 297 Serialize and Deserialize Binary Tree 27.8% Hard
* 301 Remove Invalid Parentheses 31.9% Hard
* 311 Sparse Matrix Multiplication 47.2% Medium
* 314 Binary Tree Vertical Order Traversal 30.3% Medium
* 325 Maximum Size Subarray Sum Equals k 39.9% Easy
* 334 Increasing Triplet Subsequence 33.2% Medium*
### Twitter(21)
* Regular Expression Matching 22.0% Hard
* 12 Integer to Roman 38.8% Medium
* 20 Valid Parentheses 29.3% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 42 Trapping Rain Water 32.2% Hard
* 43 Multiply Strings 23.4% Medium
* 56 Merge Intervals 25.3% Hard
* 60 Permutation Sequence 25.1% Medium
* 118 Pascal’s Triangle 33.3% Easy
* 140 Word Break II 19.7% Hard
* 146 LRU Cache 15.8% Hard
* 149 Max Points on a Line 14.2% Hard
* 161 One Edit Distance 28.4% Medium
* 202 Happy Number 36.5% Easy
* 206 Reverse Linked List 39.4% Easy
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 218 The Skyline Problem 22.0% Hard
* 235 Lowest Common Ancestor of a Binary Search Tree 37.7% Easy
* 251 Flatten 2D Vector 33.8% Medium
* 269 Alien Dictionary 22.9% Hard
* 296 Best Meeting Point 46.7% Hard*
### Zenefit(21)
* 4 Median of Two Sorted Arrays 18.6% Hard
* 20 Valid Parentheses 29.3% Easy
* 22 Generate Parentheses 36.9% Medium
* 42 Trapping Rain Water 32.2% Hard
* 52 N-Queens II 39.2% Hard
* 109 Convert Sorted List to Binary Search Tree 30.4% Medium
* 125 Valid Palindrome 23.8% Easy
* 146 LRU Cache 15.8% Hard
* 155 Min Stack 22.0% Easy
* 168 Excel Sheet Column Title 21.6% Easy
* 169 Majority Element 41.1% Easy
* 200 Number of Islands 27.6% Medium
* 206 Reverse Linked List 39.4% Easy
* 207 Course Schedule 26.8% Medium
* 210 Course Schedule II 21.0% Medium
* 229 Majority Element II 25.6% Medium
* 239 Sliding Window Maximum 27.3% Hard
* 251 Flatten 2D Vector 33.8% Medium
* 255 Verify Preorder Sequence in Binary Search Tree 37.1% Medium
* 261 Graph Valid Tree 32.5% Medium
* 317 Shortest Distance from All Buildings 31.1% Hard
### Amazon(41)
* 1 Two Sum 23.0% Easy
* 2 Add Two Numbers 23.0% Medium
* 3 Longest Substring Without Repeating Characters 21.9% Medium
* 5 Longest Palindromic Substring 23.0% Medium
* 8 String to Integer (atoi) 13.5% Easy
* 15 3Sum 18.8% Medium
* 17 Letter Combinations of a Phone Number 28.6% Medium
* 20 Valid Parentheses 29.3% Easy
* 21 Merge Two Sorted Lists 35.4% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 42 Trapping Rain Water 32.2% Hard
* 48 Rotate Image 34.6% Medium
* 49 Group Anagrams 27.4% Medium
* 78 Subsets 31.3% Medium
* 89 Gray Code 36.3% Medium
* 98 Validate Binary Search Tree 20.9% Medium
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 121 Best Time to Buy and Sell Stock 36.0% Easy
* 126 Word Ladder II 13.6% Hard
* 127 Word Ladder 19.6% Medium
* 138 Copy List with Random Pointer 26.1% Hard
* 139 Word Break 25.2% Medium
* 141 Linked List Cycle 37.0% Medium
* 146 LRU Cache 15.8% Hard
* 155 Min Stack 22.0% Easy
* 160 Intersection of Two Linked Lists 30.2% Easy
* 167 Two Sum II – Input array is sorted 47.8% Medium
* 186 Reverse Words in a String II 29.1% Medium
* 199 Binary Tree Right Side View 34.3% Medium
* 200 Number of Islands 27.6% Medium
* 204 Count Primes 24.2% Easy
* 206 Reverse Linked List 39.4% Easy
* 215 Kth Largest Element in an Array 33.1% Medium
* 234 Palindrome Linked List 28.0% Easy
* 235 Lowest Common Ancestor of a Binary Search Tree 37.7% Easy
* 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium
* 238 Product of Array Except Self 42.6% Medium
* 239 Sliding Window Maximum 27.3% Hard
* 240 Search a 2D Matrix II 34.4% Medium
* 242 Valid Anagram 41.7% Easy
* 297 Serialize and Deserialize Binary Tree 27.8% Hard
### Microsoft(77)
* 1 Two Sum 23.0% Easy
* 2 Add Two Numbers 23.0% Medium
* 4 Median of Two Sorted Arrays 18.6% Hard
* 5 Longest Palindromic Substring 23.0% Medium
* 8 String to Integer (atoi) 13.5% Easy
* 13 Roman to Integer 39.2% Easy
* 15 3Sum 18.8% Medium
* 20 Valid Parentheses 29.3% Easy
* 21 Merge Two Sorted Lists 35.4% Easy
* 23 Merge k Sorted Lists 23.3% Hard
* 24 Swap Nodes in Pairs 35.1% Easy
* 25 Reverse Nodes in k-Group 27.5% Hard
* 26 Remove Duplicates from Sorted Array 33.4% Easy
* 28 Implement strStr() 24.8% Easy
* 33 Search in Rotated Sorted Array 30.2% Hard
* 46 Permutations 35.7% Medium
* 47 Permutations II 28.0% Medium
* 48 Rotate Image 34.6% Medium
* 53 Maximum Subarray 36.6% Medium
* 54 Spiral Matrix 22.5% Medium
* 55 Jump Game 28.2% Medium
* 56 Merge Intervals 25.3% Hard
* 71 Simplify Path 21.9% Medium
* 73 Set Matrix Zeroes 33.4% Medium
* 75 Sort Colors 34.7% Medium
* 79 Word Search 22.9% Medium
* 88 Merge Sorted Array 30.0% Easy
* 91 Decode Ways 17.5% Medium
* 94 Binary Tree Inorder Traversal 39.6% Medium
* 98 Validate Binary Search Tree 20.9% Medium
* 101 Symmetric Tree 33.9% Easy
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 103 Binary Tree Zigzag Level Order Traversal 28.6% Medium
* 106 Construct Binary Tree from Inorder and Postorder Traversal 29.0% Medium
* 112 Path Sum 31.3% Easy
* 114 Flatten Binary Tree to Linked List 31.0% Medium
* 116 Populating Next Right Pointers in Each Node 36.5% Medium
* 117 Populating Next Right Pointers in Each Node II 32.8% Hard
* 121 Best Time to Buy and Sell Stock 36.0% Easy
* 124 Binary Tree Maximum Path Sum 23.3% Hard
* 125 Valid Palindrome 23.8% Easy
* 138 Copy List with Random Pointer 26.1% Hard
* 141 Linked List Cycle 37.0% Medium
* 146 LRU Cache 15.8% Hard
* 151 Reverse Words in a String 15.7% Medium
* 153 Find Minimum in Rotated Sorted Array 36.1% Medium
* 160 Intersection of Two Linked Lists 30.2% Easy
* 162 Find Peak Element 33.0% Medium
* 165 Compare Version Numbers 17.4% Easy
* 168 Excel Sheet Column Title 21.6% Easy
* 171 Excel Sheet Column Number 41.5% Easy
* 173 Binary Search Tree Iterator 34.5% Medium
* 174 Dungeon Game 20.8% Hard
* 186 Reverse Words in a String II 29.1% Medium
* 189 Rotate Array 21.1% Easy
* 191 Number of 1 Bits 37.5% Easy
* 200 Number of Islands 27.6% Medium
* 204 Count Primes 24.2% Easy
* 206 Reverse Linked List 39.4% Easy
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 212 Word Search II 19.3% Hard
* 213 House Robber II 30.5% Medium
* 215 Kth Largest Element in an Array 33.1% Medium
* 218 The Skyline Problem 22.0% Hard
* 232 Implement Queue using Stacks 33.9% Easy
* 235 Lowest Common Ancestor of a Binary Search Tree 37.7% Easy
* 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium
* 237 Delete Node in a Linked List 43.7% Easy
* 238 Product of Array Except Self 42.6% Medium
* 258 Add Digits 48.4% Easy
* 268 Missing Number 40.0% Medium
* 270 Closest Binary Search Tree Value 34.3% Easy
* 273 Integer to English Words 18.7% Hard
* 285 Inorder Successor in BST 35.6% Medium
* 297 Serialize and Deserialize Binary Tree 27.8% Hard
* 300 Longest Increasing Subsequence 34.2% Medium
* 333 Largest BST Subtree 26.5% Medium*
### Snapchat(15)
* 36 Valid Sudoku 30.5% Easy
* 39 Combination Sum 30.9% Medium
* 44 Wildcard Matching 17.4% Hard
* 96 Unique Binary Search Trees 37.4% Medium
* 127 Word Ladder 19.6% Medium
* 140 Word Break II 19.7% Hard
* 146 LRU Cache 15.8% Hard
* 151 Reverse Words in a String 15.7% Medium
* 155 Min Stack 22.0% Easy
* 161 One Edit Distance 28.4% Medium
* 206 Reverse Linked List 39.4% Easy
* 269 Alien Dictionary 22.9% Hard
* 270 Closest Binary Search Tree Value 34.3% Easy
* 289 Game of Life 34.2% Medium
* 314 Binary Tree Vertical Order Traversal 30.3% Medium*
### Apple(28)
* 1 Two Sum 23.0% Easy
* 4 Median of Two Sorted Arrays 18.6% Hard
* 7 Reverse Integer 23.6% Easy
* 21 Merge Two Sorted Lists 35.4% Easy
* 28 Implement strStr() 24.8% Easy
* 36 Valid Sudoku 30.5% Easy
* 42 Trapping Rain Water 32.2% Hard
* 48 Rotate Image 34.6% Medium
* 69 Sqrt(x) 25.2% Medium
* 70 Climbing Stairs 36.7% Easy
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 104 Maximum Depth of Binary Tree 47.8% Easy
* 118 Pascal’s Triangle 33.3% Easy
* 149 Max Points on a Line 14.2% Hard
* 151 Reverse Words in a String 15.7% Medium
* 165 Compare Version Numbers 17.4% Easy
* 190 Reverse Bits 29.3% Easy
* 191 Number of 1 Bits 37.5% Easy
* 206 Reverse Linked List 39.4% Easy
* 207 Course Schedule 26.8% Medium
* 215 Kth Largest Element in an Array 33.1% Medium
* 221 Maximal Square 23.5% Medium
* 236 Lowest Common Ancestor of a Binary Tree 28.8% Medium
* 237 Delete Node in a Linked List 43.7% Easy
* 238 Product of Array Except Self 42.6% Medium
* 240 Search a 2D Matrix II 34.4% Medium
* 257 Binary Tree Paths 28.4% Easy
* 284 Peeking Iterator 33.5% Medium*
### Yahoo(11)
* 1 Two Sum 23.0% Easy
* 4 Median of Two Sorted Arrays 18.6% Hard
* 13 Roman to Integer 39.2% Easy
* 104 Maximum Depth of Binary Tree 47.8% Easy
* 139 Word Break 25.2% Medium
* 141 Linked List Cycle 37.0% Medium
* 146 LRU Cache 15.8% Hard
* 206 Reverse Linked List 39.4% Easy
* 217 Contains Duplicate 41.1% Easy
* 284 Peeking Iterator 33.5% Medium
* 297 Serialize and Deserialize Binary Tree 27.8% Hard*
### Dropbox(7)
* 1 Two Sum 23.0% Easy
* 4 Median of Two Sorted Arrays 18.6% Hard
* 17 Letter Combinations of a Phone Number 28.6% Medium
* 140 Word Break II 19.7% Hard
* 289 Game of Life 34.2% Medium
* 290 Word Pattern 29.0% Easy
* 291 Word Pattern II 34.8% Hard*
### Bloomberg(57)
* 1 Two Sum 23.0% Easy
* 2 Add Two Numbers 23.0% Medium
* 3 Longest Substring Without Repeating Characters 21.9% Medium
* 5 Longest Palindromic Substring 23.0% Medium
* 7 Reverse Integer 23.6% Easy
* 8 String to Integer (atoi) 13.5% Easy
* 11 Container With Most Water 34.5% Medium
* 13 Roman to Integer 39.2% Easy
* 15 3Sum 18.8% Medium
* 16 3Sum Closest 29.0% Medium
* 20 Valid Parentheses 29.3% Easy
* 24 Swap Nodes in Pairs 35.1% Easy
* 26 Remove Duplicates from Sorted Array 33.4% Easy
* 33 Search in Rotated Sorted Array 30.2% Hard
* 42 Trapping Rain Water 32.2% Hard
* 49 Group Anagrams 27.4% Medium
* 50 Pow(x, n) 27.9% Medium
* 53 Maximum Subarray 36.6% Medium
* 56 Merge Intervals 25.3% Hard
* 62 Unique Paths 36.2% Medium
* 63 Unique Paths II 29.3% Medium
* 69 Sqrt(x) 25.2% Medium
* 79 Word Search 22.9% Medium
* 88 Merge Sorted Array 30.0% Easy
* 98 Validate Binary Search Tree 20.9% Medium
* 100 Same Tree 43.2% Easy
* 101 Symmetric Tree 33.9% Easy
* 102 Binary Tree Level Order Traversal 32.7% Easy
* 103 Binary Tree Zigzag Level Order Traversal 28.6% Medium
* 105 Construct Binary Tree from Preorder and Inorder Traversal 28.6% Medium
* 110 Balanced Binary Tree 34.0% Easy
* 113 Path Sum II 28.2% Medium
* 117 Populating Next Right Pointers in Each Node II 32.8% Hard
* 121 Best Time to Buy and Sell Stock 36.0% Easy
* 122 Best Time to Buy and Sell Stock II 42.2% Medium
* 131 Palindrome Partitioning 27.6% Medium
* 138 Copy List with Random Pointer 26.1% Hard
* 139 Word Break 25.2% Medium
* 141 Linked List Cycle 37.0% Medium
* 146 LRU Cache 15.8% Hard
* 151 Reverse Words in a String 15.7% Medium
* 155 Min Stack 22.0% Easy
* 158 Read N Characters Given Read4 II – Call multiple times 23.4% Hard
* 160 Intersection of Two Linked Lists 30.2% Easy
* 172 Factorial Trailing Zeroes 32.7% Easy
* 189 Rotate Array 21.1% Easy
* 206 Reverse Linked List 39.4% Easy
* 208 Implement Trie (Prefix Tree) 25.3% Medium
* 215 Kth Largest Element in an Array 33.1% Medium
* 225 Implement Stack using Queues 30.5% Easy
* 230 Kth Smallest Element in a BST 37.6% Medium
* 232 Implement Queue using Stacks 33.9% Easy
* 268 Missing Number 40.0% Medium
* 274 H-Index 29.3% Medium
* 283 Move Zeroes 44.0% Easy
* 287 Find the Duplicate Number 38.5% Hard
* 297 Serialize and Deserialize Binary Tree 27.8% Hard*
### Yelp(12)
* 1 Two Sum 23.0% Easy
* 3 Longest Substring Without Repeating Characters 21.9% Medium
* 14 Longest Common Prefix 28.1% Easy
* 49 Group Anagrams 27.4% Medium
* 56 Merge Intervals 25.3% Hard
* 126 Word Ladder II 13.6% Hard
* 127 Word Ladder 19.6% Medium
* 151 Reverse Words in a String 15.7% Medium
* 206 Reverse Linked List 39.4% Easy
* 207 Course Schedule 26.8% Medium
* 218 The Skyline Problem 22.0% Hard
* 242 Valid Anagram 41.7% Easy*
### Palantir(7)
* 136 Single Number 49.6% Medium
* 146 LRU Cache 15.8% Hard
* 217 Contains Duplicate 41.1% Easy
* 219 Contains Duplicate II 29.9% Easy
* 220 Contains Duplicate III 18.5% Medium
* 303 Range Sum Query – Immutable 24.4% Easy
* 325 Maximum Size Subarray Sum Equals k 39.9% Easy*
### Adobe(12)
* 1 Two Sum 23.0% Easy
* 2 Add Two Numbers 23.0% Medium
* 3 Longest Substring Without Repeating Characters 21.9% Medium
* 4 Median of Two Sorted Arrays 18.6% Hard
* 15 3Sum 18.8% Medium
* 70 Climbing Stairs 36.7% Easy
* 169 Majority Element 41.1% Easy
* 195 Tenth Line 32.4% Easy
* 206 Reverse Linked List 39.4% Easy
* 237 Delete Node in a Linked List 43.7% Easy
* 258 Add Digits 48.4% Easy
* 292 Nim Game 52.7% Easy