58. Length of Last Word

題目原文

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.

Example:

Input: "Hello World"
Output: 5

解題思路

1. 利用std::istringstream::str來拆解字串。

程式解答

class Solution 
{
public:
    int lengthOfLastWord(string s) 
    {
        std::vector<std::string> result;
        std::istringstream iss(s);
        for (std::string s; iss >> s; )
            result.push_back(s);
        if (!result.size())
            return 0;
        return result[result.size() - 1].length();
    }
};