Length of Last Word

<-E 58> Length of Last Word

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