[leetcode] Length of Last Word

class Solution {public:    int lengthOfLastWord(string s) {        int len = 0;                bool flag = false;        for(int i = s.size()-1;i>=0;i--)        {            if(s[i] == ' ' && !flag)                continue;            if(s[i] !=' ')            {                flag = true;                len++;            }            else                break;        }        return len;    }};