0058-length-of-last-word.cpp

class Solution {
public:
    int lengthOfLastWord(string s) {
        int ans = 0;
        for(int i=s.size()-1;i>=0;--i){
            if(s[i] == ' ' && ans > 0) return ans;
            if(s[i] != ' ') ans++;
        }
        return ans;
    }
};