LeetCode Solutions - Algorithms

Easy

Number	Title
001	Two Sum
020	Valid Parentheses
021	Merge Two Sorted Lists
108	Convert Sorted Array to Binary Search Tree
121	Best Time to Buy and Sell Stock
141	Linked List Cycle
155	Min Stack
160	Intersection of Two Linked Lists
206	Reverse Linked List
235	Lowest Common Ancestor of a BST
258	Add Digits
266	Palindrome Permutation
270	Closest Binary Search Tree Value
292	Nim Game
293	Flip Game
344	Reverse String
346	Moving Average from Data Stream
414	Third Maximum Number
438	Find All Anagrams in a String

Medium

Number	Title
002	Add Two Number
003	Longest Substring Without Repeating Characters
005	Longest Palindromic Substring
048	Rotate Image
062	Unique Paths
098	Validate Binary Search Tree
109	Convert Sorted List to Binary Search Tree
138	Copy List with Random Pointer
200	Number of Islands
208	[Implement Trie (Prefix Tree)] (Mędium/TrieNode.md)
236	Lowest Common Ancestor of a Binary Tree
238	Product of Array Except Self
331	Verify Preorder Serialization of a Binary Tree
449	Serialize and Deserialize BST

Hard

Number	Title
042	Trapping Rain Water - NOT DONE
297	Serialize and Deserialize Binary Tree
329	Longest Increasing Path in a Matrix

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Cracking the Coding Interview

Arrays and Strings

Number	Title
1.1	Is Unique
1.2	Check Permutation
1.3	URLify
1.4	Palindrome Permutation
1.5	One Away
1.6	String Compression
1.7	Rotate Matrix
1.8	Zero Matrix
1.9	String Rotation

Linked Lists

Number	Title
2.1	Remove Dups
2.2	Return Kth to Last
2.3	Delete Middle Node
2.4	Partition
2.5	Sum Lists
2.6	Palindrome
2.7	Intersection
2.8	Loop Detection

Stacks and Queues

Number	Title
3.1	Three in One
3.2	Stack Min
3.3	Stack of Plates
3.4	Queue via Stacks
3.5	Sort Stack
3.6	Animal Shelter

Trees and Graphs

Number	Title
4.1	Route Between Nodes
4.2	Minimal Tree
4.3	List of Depths
4.4	Check Balanced
4.5	Validate BST
4.6	Successor
4.7	Build Order
4.8	First Common Ancestor
4.9	BST Sequence
4.10	Check Subtree
4.11	Random Node
4.12	Paths With Sum

Facebook

Number	Title
283	Move Zeros
325	Maximum Size Subarray Sum Equals k
067	Add Binary
311	Sparse Matrix Multiplication
314	Binary Tree Vertical Order Traversal
017	Letter Combinations of a Phone Number
278	First Bad Version
253	Meeting Rooms II
015	3Sum
277	Find the Celebrity
200	NumberOfIslands
257	Binary Tree Path
161	One Edit Distance
285	Inorder Successor in BST
211	Add and Search Word
139	Word Break
121	Best Time to Buy and Sell Stock
056	Merge Intervals
341	Flatten Nested List Iterator
001	Two Sum
173	Binary Search Tree Iterator
125	Valid Palindrome
075	Sort Colors
078	Subsets
098	Validate Binary Search Tree
043	Multiply Strings
206	Reverse Linked List
133	Clone Graph
252	Meeting Rooms
236	Lowest Common Ancestor of a Binary Tree
049	Group Anagrams
079	*Word Search
238	Product of Array Except Self
038	Count and Say
209	Minimum Size Subarray Sum
215	Kth Largest Element in an Array
071	Simplify Path
013	Roman to Integer
033	Search in Rotated Sorted Array
208	Implement Trie
090	Subsets II
380	Insert Delete GetRandom O(1)
102	Binary Tree Level Order Traversal
377	Combination Sum IV
088	Merge Sorted Array
028	Implement strStr()