Daily solve problems on Leetcode

#	Title	Difficulty	JavaScript	Cpp
1	Two Sum	$${\color{#00b8a3}Easy}$$	Solution	Solution
2	Add Two Number	$${\color{#ffc01e}Medium}$$	Solution	Solution
3	Longest Substring Without Repeating Characters	$${\color{#ffc01e}Medium}$$	Solution	Solution
4	Median of Two Sorted Arrays	$${\color{#ff375f}Hard}$$	Solution	Solution