Leetcode 159 Longest Substring with At Most Two Distinct Characters G家OA原题
Given a string s , find the length of the longest substring t that contains at most 2 distinct characters. Example 1: Input: “eceba” Output: 3 Explanation: t is “ece” which its length is 3. Example 2: Input: “ccaabbb” Output: 5 Explanation: t is “aabbb” …