题解 | #求int型正整数在内存中存储时1的个数#

import java.util.*;
public class Main{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int year = in.nextInt();
        int month = in.nextInt();
        int day = in.nextInt();
        int count = 0;
        switch(month){
            case 12:
                count += 30;
            case 11:
                count += 31;
            case 10:
                count += 30;
            case 9:
                count += 31;
            case 8:
                count += 31;
            case 7:
                count += 30;
            case 6:
                count += 31;
            case 5:
                count += 30;
            case 4:
                count += 31;
            case 3:
                if((year%4 == 0 &&year %100 != 0)||year % 400 == 0){
                    count+=29;
                }
                else
                    count += 28;
            case 2:
                count += 31;
            case 1:
                count += day;
        }
        System.out.println(count);
    }
}