leetcode 第三题 最长不重复子串

class Solution {
public:
    int lengthOfLongestSubstring(string s) {
        
    map mymap;
	int length =s.length();
	int *p = (int *)malloc(sizeof(int)*(length+1));
	memset(p,0,sizeof(int)*(length+1));

	int max = 0;
	int begin_site = 1;

	for(int i=0;imax)
				max = p[i+1];
		}else
		{
			if(mymap[s.at(i)]max)
					max = p[i+1];
			}else
			{
				begin_site = mymap[s.at(i)];
				p[i+1] = i+1 - mymap[s.at(i)];
				if(p[i+1]>max)
					max = p[i+1];
			}
			mymap[s.at(i)] = i+1;
		}
	}
	
	return max;
    }
};

想了一天才做出来，超级开心O(∩_∩)O~~ ，注意记录子串的其实位置，并与重复出现位置进行比较！