蓝桥杯算法训练VIP-黑色星期五 （Java代码）

解题思路:

注意事项:

参考代码:

import java.util.Calendar;

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

int n=input.nextInt();

Calendar cal=Calendar.getInstance();

cal.set(Calendar.YEAR, n);

int count=0;

for (int i = 1; i <=12; i++) {

cal.set(Calendar.MONTH,i-1);

cal.set(Calendar.DAY_OF_MONTH, 13);

int k=cal.get(Calendar.DAY_OF_WEEK)-1;

if(k==5)count++;

}

System.out.println(count);

}

}