[LeetCode] Classification

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Problem	Classification	Method
Evaluate Reverse Polish Notation	Math	Stack
Max Points on a Line	Count	Map
Sort List	List, BST, Graph	Merge Sort
LRU Cache	Design	Map, List
Binary Tree Postorder Traversal	List, BST, Graph	Stack
Binary Tree Preorder Traversal	List, BST, Graph	Stack
Reorder List	List, BST, Graph	Divide
Linked List Cycle II	List, BST, Graph	Two Pointers
Linked List Cycle	List, BST, Graph	Two Pointers
Word Break II	List, BST, Graph	DP
Word Break	List, BST, Graph	DP
Copy List with Random Pointer	List, BST, Graph	MAP, Copy&Break
Single Number II	Math	Bit
Single Number	Math	Bit
Candy	Math	Stack
Gas Station	Math	DP
Clone Graph	List, BST, Graph	Map
Palindrome Partitioning II	String	DP
Palindrome Partitioning	String	DP
Surrounded Regions	List, BST, Graph	BST
Sum Root to Leaf Numbers	List, BST, Graph	DSF
Longest Consecutive Sequence	Math	Set
Word Ladder II	List, BST, Graph	BST
Word Ladder	List, BST, Graph	BST
Valid Palindrome	String	Two Pointers
Binary Tree Maximum Path Sum	List, BST, Graph	DFS
Best Time to Buy and Sell Stock III	Array	Stack, DP
Best Time to Buy and Sell Stock II	Array
Best Time to Buy and Sell Stock	Array
Triangle	Math	DP
Pascal's Triangle II	Math	DP
Pascal's Triangle	Math	DP
Populating Next Right Pointers in Each Node II	List, BST, Graph	Two Pointers
Populating Next Right Pointers in Each Node	List, BST, Graph	Two Pointers
Distinct Subsequences	String	DP
Flatten Binary Tree to Linked List	List, BST, Graph	DFS, Wrapper
Path Sum II	List, BST, Graph	DFS
Path Sum	List, BST, Graph	DFS
Minimum Depth of Binary Tree	List, BST, Graph	DFS
Balanced Binary Tree	List, BST, Graph	DFS
Convert Sorted List to Binary Search Tree	List, BST, Graph	Divide and Conquer
Convert Sorted Array to Binary Search Tree	List, BST, Graph	Divide and Conquer
Binary Tree Level Order Traversal II	List, BST, Graph	List
Construct Binary Tree from Inorder and Postorder Traversal	List, BST, Graph	Divide and Conquer
Construct Binary Tree from Preorder and Inorder Traversal	List, BST, Graph	Divide and Conquer
Maximum Depth of Binary Tree	List, BST, Graph	DFS
Binary Tree Zigzag Level Order Traversal	List, BST, Graph	BSF, List
Binary Tree Level Order Traversal	List, BST, Graph	BSF, List
Symmetric Tree	List, BST, Graph	DFS, Divide & Conquer
Same Tree	List, BST, Graph	DFS, Divide & Conquer
Recover Binary Search Tree	List, BST, Graph	DFS, In-Order, Store
Recover Binary Search Tree	List, BST, Graph	DFS, In-Order, Store
Validate Binary Search Tree	List, BST, Graph	DFS, In-Order, Store
Interleaving String	String	DP
Unique Binary Search Trees II	String	DP
Unique Binary Search Trees	String	DFS, Divide & Conquer
Binary Tree Inorder Traversal	String	DFS, Divide & Conquer
Restore IP Addresses	String	DFS
Reverse Linked List II	List, BST, Graph	Two Pointers
Subsets II	List, BST, Graph	DFS
Decode Ways	String, List, BST, Graph	DFS
Gray Code	Math, String, List, BST, Graph	DFS, Math
Merge Sorted Array	Sort	Merge Sort
Scramble String	String, List, BST, Graph	DFS
Partition List	List, BST, Graph	Two Pointers
Maximal Rectangle	List, BST, Graph	DP
Largest Rectangle in Histogram	List, BST, Graph	DP
Remove Duplicates from Sorted List II	List, BST, Graph	Two Pointers
Remove Duplicates from Sorted List	List, BST, Graph	Two Pointers
Search in Rotated Sorted Array II	List, BST, Graph	Divided & Conquer, Binary Search
Remove Duplicates from Sorted Array II	List, BST, Graph	Two Pointers
Word Search	List, BST, Graph	DFS
Subsets	List, BST, Graph	DFS
Combinations	List, BST, Graph	DFS
Minimum Window Substring	String, List, BST, Graph	Count
Sort Colors	Sort, List, BST, Graph	Two Pointers
Search a 2D Matrix	List, BST, Graph	Binary Search, Transformation
Set Matrix Zeroes	other	other
Edit Distance	String, List, BST, Graph	DP
Simplify Path	String, List, BST, Graph	DP, Stack
Climbing Stairs	List, BST, Graph	DP
Sqrt(x)	Math	Binary Search, Bit Manipulation
Text Justification	String	Other
Plus One	Math	Other
Valid Number	String	Other
Merge Two Sorted Lists	List, BST, Graph	Merge Sort
Minimum Path Sum	List, BST, Graph	DFS
Unique Paths II	List, BST, Graph	DP
Unique Paths	List, BST, Graph	DP
Rotate List	List, BST, Graph	Two Pointers
Permutation Sequence	Math	Bit Manipulation
Spiral Matrix II	Other	Other
Length of Last Word	String	Other
Insert Interval	Other	Other
Merge Intervals	Other	Other
Jump Game	List, BST, Graph	DP
Spiral Matrix	Other	Other
Maximum Subarray	List, BST, Graph	DP
N-Queens II	List, BST, Graph	DFS
N-Queens	List, BST, Graph	DFS
Pow(x, n)	Math	Bit Manipulation
Anagrams	String	Count
Rotate Image	Other	Other
Permutations II	Math	Other
Permutations	Math	Other
Jump Game II	List, BST, Graph	DP
Wildcard Matching	String, Pattern	Greedy
Multiply Strings	Math	Other
Trapping Rain Water	Math	DP
First Missing Positive	Math	Two Pointers
Combination Sum II	Math	DP
Combination Sum	Math	DP
Count and Say	String	DP
Sudoku Solver	List, BST, Graph	Other
Valid Sudoku	List, BST, Graph	DFS
Search Insert Position	List, BST, Graph	Binary Search
Search for a Range	List, BST, Graph	Binary Search
Search in Rotated Sorted Array	List, BST, Graph	Binary Search
Longest Valid Parentheses	String, List, BST, Graph	DP
Next Permutation	Math	Other
Substring with Concatenation of All Words	String, List, BST, Graph	DFS
Divide Two Integers	Math	Bit Manipulation
Implement strStr()	String, Pattern	Brute Force, KMP
Remove Element	List, BST, Graph	Two Pointers
Remove Duplicates from Sorted Array	List, BST, Graph	Two Pointers
Reverse Nodes in k-Group	List, BST, Graph	Two Pointers
Swap Nodes in Pairs	List, BST, Graph	Two Pointers
Merge k Sorted Lists	List, BST, Graph	Heap, Compare
Generate Parentheses	String, List, BST, Graph	DP
Valid Parentheses	String, List, BST, Graph	Stack
Remove Nth Node From End of List	List, BST, Graph	Two Pointers
Letter Combinations of a Phone Number	String, List, BST, Graph	DFS, Backtrace
Letter Combinations of a Phone Number	String, List, BST, Graph	DFS, Backtrace
4 Sum	Math, Combination	Two Pointers
3 Sum Closest	Math, Combination	Two Pointers
3 Sum	Math, Combination	Two Pointers
Longest Common Prefix	String, List, BST, Graph
Roman to Integer	String	Other, Pattern
Integer to Roman	String	Other, Pattern
Container With Most Water	List, BST, Graph	Two Pointers, Other
Regular Expression Matching	String, List, BST, Graph	DFS, Greedy
Palindrome Number	String, List, BST, Graph	Two Pointers
String to Integer (atoi)	String	Other
Reverse Integer	Math	Overflow
ZigZag Conversion	Other	Other
Longest Palindromic Substring	String	DP, Manacher's Algorithm
Add Two Numbers	Other	Other
Longest Substring Without Repeating Characters	String	Two Pointers
Median of Two Sorted Arrays	Math	Divide & Conquer
2 Sum	Math	Two Pointers