3 Longest Substring Without Repeating Characters
題目： 即找到最大無重複字母的子串。 考慮思路： 1）以鍵值對的形式存儲字符串。其中，以字符爲鍵，其索引爲值。 根據鍵的唯一性，我們可以知道該hashmap表中存儲的是字符串的全部不重複的字符。 2）遍歷字符串時，首先設置滑動窗口，當遍歷到S[i]到S[j]之間時，如果存在與S[j+1]相同的字符S[k]，記錄下此時得到的不重複子串的長度j+1-k。並且將窗口的左端移動到k，並且，即重新往後遍歷，
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