leetcode 58. Length of Last Word

class Solution {public:    int lengthOfLastWord(string s) {        int be = s.length()-1,end = s.length()-1;        for(;end >= 0;){            if(s[end] != ' ') break;            end--;        }        for(be = end;be >= 0;be--){            if(s[be] == ' ') break;        }                return end - be;    }};