leetcode 058 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) {
        if(s == "") return 0;
		
		int len = s.length();
		int sum = 0, cnt = 0;

		for(int i = 0; i < len; i++) {
			if(s[i] == ' ') {
				if(cnt > 0) sum = cnt;
				cnt = 0;
			} else {
				cnt++;
			}
		}

		if(cnt > 0) sum = cnt;
		return sum;
    }
};