58. Length of Last Word

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.

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class Solution {public:    int lengthOfLastWord(string s) {        int len=s.size()-1;        int ans=0;        while(s[len]==' '){len--;}//注意需要去掉末尾的空格        for(int i=len;i>=0;i--)        {            if(s[i]==' ')break;            ans++;        }        return ans;    }};