Leetcode Question Number 3

[amanv8060]

Leetcode Question Number 3 soultion needs to be added in the repo . The link for the question is this. Accepted Languages C++ / JAVA . You Only need to add the class Solution in the file. Make Sure you have read the contributions guidelines before creating an PR.

[Khushi-agarwal]

@amanv8060 please assign me this issue under hacktoberfest.