public static void main(String args[]) {
        LongestSubstringWithAtMost2Char lc = new LongestSubstringWithAtMost2Char();
        System.out.print(lc.lengthOfLongestSubstringTwoDistinct("eceba"));
    }
Longest Substring with At Most Two Distinct Characters
https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/
src/com/interview/array/LongestSubstringWithAtMost2Char.java