题解 | #计算日期到天数转换#

import java.util.HashMap;
import java.util.Scanner;


// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static HashMap<Integer,Integer> daysOfMonth =new HashMap();
    static
    {
        daysOfMonth.put(1,31);
        daysOfMonth.put(3,31);
        daysOfMonth.put(5,31);
        daysOfMonth.put(7,31);
        daysOfMonth.put(8,31);
        daysOfMonth.put(10,31);
        daysOfMonth.put(12,31);
        daysOfMonth.put(2,28);
       
        daysOfMonth.put(6,30);
        daysOfMonth.put(9,30);
        daysOfMonth.put(4,30);
        daysOfMonth.put(11,30);

    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
           int year = in.nextInt();
        int month = in.nextInt();
        int day = in.nextInt();
        int days =0;
        for(int i=1;i<=month-1;i++)
        {
            days+=daysOfMonth.get(i);
        }
        days+=day;
        if(isLeapYear(year) && month>2)
        {

            days+=1;
        };
        System.out.println(days);
        }
    }
    public static boolean isLeapYear(int year)
    {
        return year%400 ==0||year%4==0&&year%100!=0;
    }
}