LeetCode 3

题目复述：求一字符串中不重复的连续最长字符子串长度

class Solution {
public:
    int lengthOfLongestSubstring(string s) {
	unordered_set<char> temp;
	int n=s.size();
	int rr=-1,lenMax=0;
	for(int i=0;i<n;i++){
		if(i!=0){
			temp.erase(s[i-1]);
		}
		while(rr+1<n&&!temp.count(s[rr+1])){
			temp.insert(s[rr+1]);
			++rr;
		}
		lenMax=max(lenMax,rr-i+1);
	}
	return lenMax;
    }
};