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;
    }
};