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0001 Two Sum
0001 Two Sum
 
 
0002 Add Two Numbers
0002 Add Two Numbers
 
 
0003 Longest Substring Without Repeating Characters
0003 Longest Substring Without Repeating Characters
 
 
0004 Median of Two Sorted Arrays
0004 Median of Two Sorted Arrays
 
 
0005 Longest Palindromic Substring
0005 Longest Palindromic Substring
 
 
0006 ZigZag Conversion
0006 ZigZag Conversion
 
 
0007 Reverse Integer
0007 Reverse Integer
 
 
0008 String to Integer (atoi)
0008 String to Integer (atoi)
 
 
0009 Panlidrome Number
0009 Panlidrome Number
 
 
0010 Regular Expression Matching
0010 Regular Expression Matching
 
 
0011 Container With Most Water
0011 Container With Most Water
 
 
0012 Integer to Roman
0012 Integer to Roman
 
 
0013 Roman to Integer
0013 Roman to Integer
 
 
0014 Longest Common Prefix
0014 Longest Common Prefix
 
 
0015 3Sum
0015 3Sum
 
 
0016 3Sum Closest
0016 3Sum Closest
 
 
0017 Letter Combinations of a Phone Number
0017 Letter Combinations of a Phone Number
 
 
0018 4Sum
0018 4Sum
 
 
0019 Remove Nth Node From End of List
0019 Remove Nth Node From End of List
 
 
0020 Valid Parentheses
0020 Valid Parentheses
 
 
0021 Merge Two Sorted Lists
0021 Merge Two Sorted Lists
 
 
0022 Generate Parentheses
0022 Generate Parentheses
 
 
0023 Merge K Sorted Lists
0023 Merge K Sorted Lists
 
 
0024 Swap Nodes In Pairs
0024 Swap Nodes In Pairs
 
 
0025 Reverse Nodes in k-Group
0025 Reverse Nodes in k-Group
 
 
0026 Remove Duplicates from Sorted Array
0026 Remove Duplicates from Sorted Array
 
 
0030 Substring with Concatenation of All Words
0030 Substring with Concatenation of All Words
 
 
0031 Next Permutation
0031 Next Permutation
 
 
0032 Longest Valid Parentheses
0032 Longest Valid Parentheses
 
 
0033 Search in Rotated Sorted Array
0033 Search in Rotated Sorted Array
 
 
0036 Valid Sudoku
0036 Valid Sudoku
 
 
0039 Combination Sum
0039 Combination Sum
 
 
0043 Multiply Strings
0043 Multiply Strings
 
 
0046 Permutations
0046 Permutations
 
 
0050 Pow(x, n)
0050 Pow(x, n)
 
 
0053 Maximum Subarray
0053 Maximum Subarray
 
 
0060 Permutation Sequence
0060 Permutation Sequence
 
 
0061 Rotate List
0061 Rotate List
 
 
0062 Unique Paths
0062 Unique Paths
 
 
0076 Mimum Window Substring
0076 Mimum Window Substring
 
 
0077 Combinations
0077 Combinations
 
 
0078 Subsets
0078 Subsets
 
 
0079 Word Search
0079 Word Search
 
 
0080 Remove Duplicates from Sorted Array II
0080 Remove Duplicates from Sorted Array II
 
 
0081 Search in Rotated Sorted Array II
0081 Search in Rotated Sorted Array II
 
 
0082 Remove Duplicates from Sorted List II
0082 Remove Duplicates from Sorted List II
 
 
0083 Remove Duplicates from Sorted List
0083 Remove Duplicates from Sorted List
 
 
0086 Partition List
0086 Partition List
 
 
0087 Scramble String
0087 Scramble String
 
 
0090 Subsets II
0090 Subsets II
 
 
0091 Decode Ways
0091 Decode Ways
 
 
0092 Reverse Linked List II
0092 Reverse Linked List II
 
 
0094 Binary Tree Inorder Traversal
0094 Binary Tree Inorder Traversal
 
 
0096 Unique Binary Search Trees
0096 Unique Binary Search Trees
 
 
0098 Validate Binary Search Tree
0098 Validate Binary Search Tree
 
 
0099 Recover Binary Search Tree
0099 Recover Binary Search Tree
 
 
0100 Same Tree
0100 Same Tree
 
 
0101 Symmetric Tree
0101 Symmetric Tree
 
 
0102 Binary Tree Level Order Traversal
0102 Binary Tree Level Order Traversal
 
 
0103 Binary Tree Zigzag Level Order Traversal
0103 Binary Tree Zigzag Level Order Traversal
 
 
0104 Maximum Depth of Binary Tree
0104 Maximum Depth of Binary Tree
 
 
0105 Construct Binary Tree from Preorder and Inorder Traversal
0105 Construct Binary Tree from Preorder and Inorder Traversal
 
 
0107 Binary Tree Level Order Traversal II
0107 Binary Tree Level Order Traversal II
 
 
0108 Covert Sorted Array to Binary Search Tree
0108 Covert Sorted Array to Binary Search Tree
 
 
0110 Balanced Binary Tree
0110 Balanced Binary Tree
 
 
0111 Minimum Depth of Binary Tree
0111 Minimum Depth of Binary Tree
 
 
0118 Pascal's Triangle
0118 Pascal's Triangle
 
 
0119 Pascal's Triangle II
0119 Pascal's Triangle II
 
 
0123 Best Time to Buy and Sell Stock III
0123 Best Time to Buy and Sell Stock III
 
 
0124 Binary Tree Maximum Path Sum
0124 Binary Tree Maximum Path Sum
 
 
0126 Word Ladder II
0126 Word Ladder II
 
 
0129 Sum Root to Leaf Number
0129 Sum Root to Leaf Number
 
 
0130 Surrounded Regions
0130 Surrounded Regions
 
 
0141 Linked List Cycle
0141 Linked List Cycle
 
 
0146 LRU Cache
0146 LRU Cache
 
 
0153 Find Minimum in Rotated Sorted Array
0153 Find Minimum in Rotated Sorted Array
 
 
0159 Longest Substring with at Most Two Distinct Characters
0159 Longest Substring with at Most Two Distinct Characters
 
 
0160 Intersection of Two Linked Lists
0160 Intersection of Two Linked Lists
 
 
0169 Majority Element
0169 Majority Element
 
 
0173 Binary Search Tree Iterator
0173 Binary Search Tree Iterator
 
 
0188 Best Time to Buy and Sell Stock IV
0188 Best Time to Buy and Sell Stock IV
 
 
0199 Binary Tree Right Side View
0199 Binary Tree Right Side View
 
 
0200 Number of Islands
0200 Number of Islands
 
 
0203 Remove Linked List Elements
0203 Remove Linked List Elements
 
 
0207 Course Schedule
0207 Course Schedule
 
 
0210 Course Schedule II
0210 Course Schedule II
 
 
0216 Combination Sum III
0216 Combination Sum III
 
 
0229 Majority Element II
0229 Majority Element II
 
 
0230 Kth Smallest Element in a BST
0230 Kth Smallest Element in a BST
 
 
0235 Lowest Common Ancestor of a Binary Search Tree
0235 Lowest Common Ancestor of a Binary Search Tree
 
 
0236 Lowest Common Ancestor of a Binary Tree
0236 Lowest Common Ancestor of a Binary Tree
 
 
0237 Delete Node in a Linked List
0237 Delete Node in a Linked List
 
 
0250 Count Univalue Subtrees
0250 Count Univalue Subtrees
 
 
0254 Factor Combinations
0254 Factor Combinations
 
 
0269 Alien Dictionary
0269 Alien Dictionary
 
 
0270 Closest Binary Search Tree Value
0270 Closest Binary Search Tree Value
 
 
0272 Closest Binary Search Tree Value II
0272 Closest Binary Search Tree Value II
 
 
0274 H-Index
0274 H-Index
 
 
0278 First Bad Version
0278 First Bad Version
 
 
0285 Inorder Successor in BST
0285 Inorder Successor in BST
 
 

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LeetCode

Problem # Title Difficulty Solution Note Topics Top 3 Companies
001 Two Sum Easy Python Java Array, Hash Table Google, Adobe, Amazon
002 Add Two Numbers Medium Python Java Note Linked List, Math Amazon, Google, Adobe
003 Longest Substring Without Repeating Characters Medium Python Java Note Hash Table, Two Pointers, String, Sliding Window Google, Amazon, Facebook
004 Median of Two Sorted Arrays Hard Python Java Note Array, Binary Search, Divide and Conquer Google, Amazon, Adobe
005 Longest Palindromic Substring Medium Python Java Note String, Dynamic Programming Amazon, Microsoft, Facebook
006 ZigZag Conversion Medium Python Java Note String Amazon, Google, Facebook
007 Reverse Integer Easy Python Java Note Math Adobe, Amazon, Apple
008 String to Integer (atoi) Medium Python Java Note Math, String Microsoft, Facebook, Amazon
009 Palindrome Number Easy Python Java Math Amazon, Facebook, Bloomberg
010 Regular Expression Matching Hard Python Java Note String, Dynamic Programming, Backtracking Facebook, Microsoft, Coursera
011 Container With Most Water Medium Python Java Note Array, Two Pointers Amazon, Google, Goldman Sachs
012 Integer to Roman Medium Python Java Note Math, String Amazon, Microsoft, Google
013 Roman to Integer Easy Python Java Note Math, String Facebook, Amazon, Microsoft
014 Longest Common Prefix Easy Python Java Note String Facebook, Adobe, Amazon
015 3Sum Medium Python Java Note Array, Two Pointers Facebook, Amazon, Google
016 3Sum Closest Medium Python Java Note Array, Two Pointers Amazon, Google, Adobe
017 Letter Combinations of a Phone Number Medium Python Java Note String, Backtracking Facebook, Microsoft, Amazon
018 4Sum Medium Python Java Note Array, Hash Table, Two Pointers Google, Apple, Amazon
019 Remove Nth Node From End of List Medium Python Java Note Linked List, Two Pointers Google, Microsoft, Amazon
020 Valid Parentheses Easy Python Java Note String, Stack Amazon, Facebook, Microsoft
021 Merge Two Sorted Lists Easy Python Java Linked List Amazon, Apple, Google
022 Genrate Parentheses Medium Python Java Note String, Backtracking Amazon, Google, Microsoft
023 Merge K Sorted List Hard Python Java Note Linked List, Divide and Conquer, Heap Facebook, Amazon, Microsoft
024 Swap Nodes in Pairs Medium Python Java Note Linked List Microsoft, Amazon, Facebook
025 Reverse Nodes in k-Group Hard Python Java Note Linked List Mathworks, Amazon, Facebook
026
027
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029
030
031
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033
034
043 Multiply Strings Medium Python Java Note Math, String Facebook, Google, Microsoft
050 Pow(x, n) Medium Python Java Note Math, Binary Search Facebook, LinkedIn, Amazon
053 Maximum Subarray Easy Python Java Note Array, Divide and Conquer, Dynamic Programming Apple, Microsoft, Google
094 Binary Tree Inorder Traversal Medium Python Java Note Hash Table, Stack, Tree Microsoft, Facebook, Amazon
102 Binray Tree Level Order Traversal Medium Python Java Note Tree, Breadth-first Search Amazon, LinkedIn, Microsoft
107 Binary Tree Level Order Traversal II Easy Python Java Note Tree, Breadth-first Search Facebook
300 Longest Increasing Subsequence Medium Python Java Note Binary Search, Dynamic Programming Facebook, Amazon, Microsoft
322 Coin Change Medium Python Java Note Dynamic Programming JPMorgan, Amazon, Microsoft
674 Longest Continuous Increasing Subsequence Easy Python Java Note Array, Sliding Window Facebook

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