58. Length of Last Word（LeetCode）

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) {
        istringstream strcin(s);
        string str;
        vector<string> str1;
        while (strcin >> str)
            str1.push_back(str);
        if (str1.size() == 0)
            return 0;
        else
            return str1.back().size();
    }
};