James Pan

原题网址：https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/ Given a string, find the length of the longest substring T that contains at most 2 distinct characters.

原题网址：https://leetcode.com/problems/valid-word-abbreviation/ Given a non-empty string s and an abbreviation abbr, return whether the string matches with the given abbreviation. A string such