leetcode

All original problems: https://leetcode.com/problems

Contents

• Algorithms
• Shell

Algorithms

#	Title	Solution & Test	Difficulty	Tags
1	Two Sum	Java	Easy	Array, Hash Table
2	Add Two Numbers	C++	Medium	Linked List, Math
3	Longest Substring Without Repeating Characters	Python	Medium	Hash Table, Two Pointers, String, Sliding Window
4	Median of Two Sorted Arrays	Suspending	Hard	Array, Binary Search, Divide and Conquer
5	Longest Palindromic Substring	Java, Pythonfaster	Medium	String, Dynamic Programming
6	ZigZag Conversion	C++slow	Medium	String
7	Reverse Integer	C++	Easy	Math
8	String to Integer (atoi)	C++	Medium	Math, String
9	Palindrome Number	C++	Easy	Math
10	Regular Expression Matching	Suspending	Hard	String, Dynamic Programming, Backtracking
11	Container With Most Water	C++x2	Medium	Array, Two Pointers
12	Integer to Roman	Python	Medium	Math, String
13	Roman to Integer	Pythonslow	Easy	Math, String
14	Longest Common Prefix	Python, Javafaster	Easy	String
15	3Sum	Java	Medium	Array,Two Pointers
16	3Sum Closest	Java	Medium	Array, Two Pointers
17	Letter Combinations of a Phone Number	Python	Medium	String, Backtracking
18	4Sum	C++	Medium	Array, Hash Table, Two Pointers
19	Remove Nth Node From End of List	C++x2	Medium	Linked List, Two Pointers
20	Valid Parentheses	C++	Easy	String, Stack
21	Merge Two Sorted Lists	C++x2: +recursion	Easy	Linked List
22	Generate Parentheses	Python	Medium	String, Backtracking
23	Merge k Sorted Lists	C++	Hard	Linked List, Divide and Conquer, Heap
24	Swap Nodes in Pairs	C++x2: +recursion	Medium	Linked List
50	Pow(x, n)	C++	Medium	Math, Binary Search
70	Climbing Stairs	C++x2: +recursion	Easy	Dynamic Programming
95	Unique Binary Search Trees II	C++	Medium	Dynamic Programming, Tree
104	Maximum Depth of Binary Tree	C++recursion(dfs), todo: bfs	Easy	Tree, Deep-first Search
118	Pascal's Triangle	C++x3: +dp, recursion	Easy	Array
119	Pascal's Triangle II	C++x2: +recursion	Easy	Array
206	Reverse Linked List	C++	Easy	Linked List
334	Reverse String	C++x2: +recursion	Easy	Two Pointers, String
509	Fibonacci Number	C++x2: +recursion	Easy	Array
779	K-th Symbol in Grammar	C++recursion	Medium	Recursion, Tree

Shell

#	Title	Solution & Test	Difficulty	Tags
192	Word Frequency	Shell	Medium