58. Length of Last Word

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# 題目敘述

Given a string s consisting of words and spaces, return the length of the last word in the string.

A word is a maximal substring consisting of non-space characters only.

Substring
A substring is a contiguous non-empty sequence of characters within a string.

# Example 1

Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.

# Example 2

Input: s = " fly me to the moon "
Output: 4
Explanation: The last word is "moon" with length 4.

# Example 3

Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.

# 解題思路

# Solution

class Solution {

    public int lengthOfLastWord(String s) {

        String[] words = s.split(" ");

        for(int i = words.length - 1; i >= 0; i--) {

            if(words[i].length() > 0) {

                return words[i].length();

            }

        }

        return 0;

    }

}

#include <string>

#include <sstream>

#include <vector>

using namespace std;

class Solution {

public:

    int lengthOfLastWord(string s) {

        vector<string> words;

        stringstream ss(s);

        string word;

        while (ss >> word) {

            words.push_back(word);

        }

        if (words.empty()) {

            return 0;

        }

        return words.back().length();

    }

};