题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int y, m;
    while (scanf("%d %d", &y, &m) != EOF)
    {
        switch(m)
        {
            case 1:printf("31\n");break;
            case 2:
                if(y%4==0&&y%100!=0||(y%400==0))
                {
                    printf("29\n");
                    break;
                }
                else {
                printf("28\n");break;
                }
            case 3:printf("31\n");break;
            case 4:printf("30\n");break;
            case 5:printf("31\n");break;
            case 6:printf("30\n");break;
            case 7:printf("31\n");break;
            case 8:printf("31\n");break;
            case 9:printf("30\n");break;
            case 10:printf("31\n");break;
            case 11:printf("30\n");break;
            case 12:printf("31\n");break;
        }
    }
    return 0;
}