leetcode——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.

class Solution {public:    int lengthOfLastWord(string s) {       if(s.empty())         return 0;                int len = s.size();       int count = 0;       while(s[len-1]==' ')          len--;                 for(int i = len-1;i>=0;i--)       {           if(s[i]==' ')             break;           count++;       }              return count;    }};