3 Longest Substring Without Repeating Characters
题目： 即找到最大无重复字母的子串。 考虑思路： 1）以键值对的形式存储字符串。其中，以字符为键，其索引为值。 根据键的唯一性，我们可以知道该hashmap表中存储的是字符串的全部不重复的字符。 2）遍历字符串时，首先设置滑动窗口，当遍历到S[i]到S[j]之间时，如果存在与S[j+1]相同的字符S[k]，记录下此时得到的不重复子串的长度j+1-k。并且将窗口的左端移动到k，并且，即重新往后遍历，
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