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) {        int len = s.size();        int i;        if(!len || s == " ") return 0;        int count = 0;        int tmp = 0;        for(i = 0; i < len; i ++){            if(s[i] != ' ') {                count ++;                tmp = count;            }            else                count = 0;        }        if(tmp && !count) count = tmp;        return count;    }};