LeetCode Length of Last Word really very easy

LeetCode Length of Last Word really very easy

class Solution {

public:

    int lengthOfLastWord(string s) {

        int l=s.size();

        int cnt=0;

        int j=l-1;

        while(j>=0 && s[j]==' ')

          j--;

        while(j>=0 && s[j]!=' '){

          cnt++;

          j--;

        }

        return cnt;

    }

};