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
028
029
030
031
032
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

Name		Name	Last commit message	Last commit date
Latest commit History 141 Commits
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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