import java.util.Scanner; public class Main{ public static void main(String[] args){ int n = new Scanner(System.in).nextInt(); if(n == 1 || n == 2){ System.out.println("1"); //前两个月兔子数是不变的,都是一 } int a = 1,b = 1,sum = 0; //两只兔子,刚开始定义和为0 for(int i = 3;i <= n;i++){ sum = a + b; //sum ,a ,b可以理解为三个容器分别...