Leetcode: 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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//codes

class Solution {

public:

    int lengthOfLastWord(string s) {

        //check input

        if(s.size()==0)return 0;

        int count=0,i=s.size()-1;

        //find the last non ' ' char

        for (;i>-1 && s[i]==' ';i--) continue;

        for (int j=i;j>-1 && s[j]!=' ';j--) count++;

        return count;

        }

};