题解 | 计算一年中的第几天

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 y = in.nextInt();
            int m = in.nextInt();
            int d = in.nextInt();
            int total = 0;
            int[] arr1 = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};//不是闰年
            int[] arr2 = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};//是闰年
            if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0) {
                for (int i = 0; i < m; i++) {
                    total += arr2[i];
                }

            } else {
                for (int i = 0; i < m; i++) {
                    total += arr1[i];
                }
            }
            total += d;
            System.out.println(total);

        }
    }
}