LeetCode OJ Longest Substring Without Repeating Characters 不重复的最长字串 滑动窗口

Longest Substring Without Repeating Characters

Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. For "bbbbb" the longest substring is "b", with the length of 1.

class Solution {
public:
    int lengthOfLongestSubstring(string s) {
        
        int has[256];
        memset(has,-1,sizeof(has));
        int i,id=-1,max=0;
        for(i=0;i<s.size();i++){
            
            if(has[s[i]]>id)
            {
                id=has[s[i]];
            }
            if(i-id>max)
            {
                max=i-id;
            }
            has[s[i]]=i;
        }
        return max;
    }
};