题解 | #斐波那契数列#

import java.util.Scanner;
import java.util.ArrayList;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        int fib = Fib(num);
        System.out.println(fib);
    }
    public static int Fib(int num) {
        if (num <= 1) {
            return num;
        } else {
            return Fib(num - 1) + Fib(num - 2);
        }
    }
}