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() - 1;
        int result = 0;
        while (s[start] == ' ') {
            start--;
        }
        for (int i = start; i >= 0; --i) {
            if (s[i] != ' ') {
                result++;
            }
            else {
                return result;
            }
        }
        return result;
    }
};