this is my solution, written in cpp , java and python
#LeetCode solved problems:
001. Two Sum
002. Add Two Numbers
003. Longest Substring Without Repeating Characters4. Median of Two Sorted
Arrays
004. Median of Two Sorted Arrays
005. Longest Palindromic Substring
006. ZigZag Conversion
007. Reverse Integer
008. String to Integer
009. Palindrome Number
010. Regular Expression Matching
011. Container With Most Water
012. Integer to Roman
013. Roman to Integer
014. Longest Common Prefix
019. Remove Nth Node From End of List
020. Valid Parenteses
021. Merge Two Sorted List