Solutions

Status	N	Title
✅	2	Add Two Numbers
✅	3	Longest Substring Without Repeating Characters
✅	4	Median of Two Sorted Arrays
✅	6	Zigzag Conversion
❌	8	String to Integer (atoi)
✅	9	Palindrome Number
❌	10	Regular Expression Matching
✅	11	Container With Most Water
✅	12	Integer to Roman
✅	13	Roman to Integer
✅	14	Longest Common Prefix
✅	15	3Sum
✅	16	3Sum Closest
✅	17	Letter Combinations of a Phone Number
✅	18	4Sum
✅	19	Remove Nth Node From End of List
✅	20	Valid Parentheses
✅	21	Merge Two Sorted Lists
✅	22	Generate Parentheses
✅	26	Remove Duplicates from Sorted Array
✅	27	Remove Element
✅	28	Find the Index of the First Occurrence in a String
❌	29	Divide Two Integers
❌	31	Next Permutation
✅	217	Contains Duplicate