题解 | #计算日期到天数转换#

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 void main(String[] args) {
        int[]run = {0, 31, 29, 31, 30,31,30,31,31,30,31,30,31};
        int[]ping = {0, 31, 28, 31, 30,31,30,31,31,30,31,30,31};
        int[]runSum = new int[13];
        int[]pingSum = new int[13];
        for(int i=1;i<13;i++) {
            runSum[i] = runSum[i-1] + run[i];
            pingSum[i] = pingSum[i-1] + ping[i];
        }
        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();
            if(year%400 == 0 || year%4==0 && year%100!=0) {
                System.out.println((runSum[month-1]+day));
            } else{
                System.out.println((pingSum[month-1]+day));
            }
        }
    }
}