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3. 无重复字符的最长子串
给定一个字符串,请你找出其中不含有重复字符的 最长子串 的长度。
示例 1:
输入: s = "abcabcbb"
输出: 3
解释: 因为无重复字符的最长子串是 "abc",所以其长度为 3。
示例 2:
输入: s = "bbbbb"
输出: 1
解释: 因为无重复字符的最长子串是 "b",所以其长度为 1。
示例 3:
输入: s = "pwwkew"
输出: 3
解释: 因为无重复字符的最长子串是 "wke",所以其长度为 3。
请注意,你的答案必须是 子串 的长度,"pwke" 是一个子序列,不是子串。
示例 4:
输入: s = ""
输出: 0
```
提示:
0 <= s.length <= 5 * 104
s 由英文字母、数字、符号和空格组成
## 滑动窗口解法 O(n)
```js
/**
* @param {string} s
* @return {number}
*/
var lengthOfLongestSubstring = function(s) {
let l = 0;
let max = 0;
const freq = {};
for (let i = 0; i < s.length; i++) {
if(freq[s[i]]) {
l = Math.max(l, freq[s[i]])
}
freq[s[i]] = i + 1;
max = Math.max(max, i - l + 1);
}
return max;
};
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