Problem https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/ Given a string, find the length of the longest substring T that contains at most k distinct characters. For example, Given s = "eceba" and k = 2, T…

Problem leetcode.com We are given a string as a file path like this: "dir\n\tsubdir1\n\tsubdir2\n\t\tfile.ext". This string means directory structure below. We answer a number of max length of file path like this: 20 (number of length abou…