Github地址 LeetCode-3 无重复字符的最长子串:https://github.com/JacobLei/leetcode/blob/master/src/main/java/A3_LongestSubstringWithoutRepeatingCharacters.java
Leetcode-3 无重复字符的最长子串 原题链接 https://leetcode-cn.com/problems/longest-substring-without-repeating-characters