LeetCode58 Length of Last Word

题目：

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 
Given s = "Hello World",
return 5. （Easy）

分析：

注意把最后的空格处理掉即可。

代码：

 class Solution {
 public:
     int lengthOfLastWord(string s) {
         int start = s.size() - ;
         int result = ;
         while (s[start] == ' ') {
             start--;
         }
         for (int i = start; i >= ; --i) {
             if (s[i] != ' ') {
                 result++;
             }
             else {
                 return result;
             }
         }
         return result;
     }
 };