题解 | #字符串最后一个单词的长度#

import java.util.Scanner;

/**
 * 从后往前计数，两种情况：一个单词；... 单词+空格+单词 ...
 */
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        int length = str.length();
        for (int count = 0, i = length -1; i >= 0; i--  ) {
            if (str.charAt(i) == ' ') {
                System.out.println(count);
                break;
            } else if (count == length - 1){
                System.out.println(length);
            } else {
                count++;
            }
        }
    }
}