import java.util.*;
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
*
*
* @param s string字符串
* @return int整型
*/
public int lengthOfLongestSubstring(String s) {
// write code here
Queue<Character> queue = new LinkedList<>();
int res = 0;
for (int i = 0; i < s.length(); i++) {
char chr = s.charAt(i);
while (queue.contains(chr)) {
queue.poll();
}
queue.add(chr);
res = Math.max(res, queue.size());
}
return res;
}
}