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YoungStudyShopping / leetcode_study

https://leetcode.com/problemset/all/
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LeetCode Study

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### 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


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