LeetCode Hash Table 3. Longest Substring Without Repeating Characters

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LeetCode Hash Table 3. Longest Substring Without Repeating Characters

HashMap的应用可以提高查找的速度,键key,值value的使用拜托了传统数组的遍历查找方式,对于判断一个字符或者字符串是否已经存在的问题可以非常好的解决.而本题需要解决的问题就是判断新遍历到的字符是否已经存在于左left,右right,字符构成的子串之中. 解题思路:设置一个left作为子串的最左边的字符位置坐标,right不断向右遍历,并对每次遍历得到的字符进行判断,max作为最大的没有重复字符的子串长度.对于right遍历得到的新的字符,有两种情况: 一:在Hash表中没有,此时该字符…

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