bigw660 / Leetcode_Summary

LeetCode Summary

Array

ID	Problem	Difficulty	Tags
1	Two Sum	Easy	K-Sum, Hash Table
15	3Sum	Medium	Sort, Bi-directional Search
289	Game of Life	Medium	Trick
84	Largest Rectangle in Histogram	Hard	Monotonic Stack
239	Sliding Window Maximum	Hard	Monotonic Queue
300	Longest Increasing Subsequence	Medium	DP, Binary Search
1713	Minimal Operations to Make a Subsequence	Hard	DP, Binary Search
23	Merge k Sorted Lists	Hard	Heap, Divide and Conquer

String

ID	Problem	Difficulty	Tags
763	Partition Labels	Medium	Hash Table
10	Regular Expression Matching	Hard	DP
32	Longest Valid Parentheses	Hard	Stack, DP
5	Longest Palindromic Substring	Medium	DP

Tree

ID	Problem	Difficulty	Tags
617	Merge Two Binary Trees	Medium	Divide and Conquer
104	Maximum Depth of Binary Tree	Easy	Divide and Conquer
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium	BFS/DFS, Bit Manipulation
98	Validate Binary Search Tree	Medium	Recursion, DFS

Graph

ID	Problem	Difficulty	Tags
399	Evaluate Division	Medium	Union-Find, Recursion

Bit Manipulation

ID	Problem	Difficulty	Tags
338	Counting Bits	Medium	DP

Greedy

ID	Problem	Difficulty	Tags
406	Queue Reconstruction by Height	Medium	Sort
330	Patching Array	Hard	Greedy, Math

Math

ID	Problem	Difficulty	Tags
754	Reach a Number	Medium	Math

Intervals

ID	Problem	Difficulty	Tags
435	Non-overlapping Intervals	Medium	Greedy, Sort