题解 | #计算日期到天数转换#，公式套起来

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) {
        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[] ints = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
            int sum = 0;
            for (int i = 0; i < month - 1; i++) {
                sum += ints[i];
            }
            if (month > 2 && isRunYear(year)) {
                sum += 1;
            }
            sum += day;
            System.out.println(sum);
        }
    }

    private static boolean isRunYear(int year) {
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
            return true;
        return false;
    }
}