给定一个字符串，从中找出不含重复字符的最长子串的长度。
Given a string, find the length of the longest substring without repeating characters.
翻译给定一个字符串，找出其没有重复字符的最大子序列的长度。
The translation given a string s, find the largest palindrome substring of it.
翻译给定一个字符串，找出其没有重复字符的最大子序列的长度。
The translation given a string s, find the largest palindrome substring of it.
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