No.	My Solution	Tag	Question
1	Two Sum	Array, Hash Table
9	Palindrome Number	Math
13	Roman to Integer	Hash Table
14	Longest Common Prefix	String
20	Valid Parentheses	Stack
21	Merge Two Sorted Lists	Linked List
26	Remove Duplicates from Sorted Array	Array, Two Pointers
27	Remove Element	Array, Two Pointers
28	Find the Index of the First Occurence in a String	String
35	Search Insert Position	Array, Binary Search
66	Plus One	Array
121	Best Time to Buy and Sell Stock	Dynamic Programming
125	Valid Palindrome	String, Two Pointers
141	Linked List Cycle	Linked List, Two Pointers
216	Reverse Linked List	Linked List, Recursion
344	Reverse String	Two Pointers