Leetcode 58 Length of Last Word 字符串

找出最后一个词的长度

 class Solution {
 public:
     int lengthOfLastWord(string s) {
         int a = , l = , b = ;
         while((b = s.find(" ", a)) != string::npos){
             if(b - a > ) l = b - a;
             a = b + ;
         }
         if(a == s.size()) return l;
         else return s.size() - a;
     }
 };