题解 | #获得月份天数#

#include<stdio.h>
int main()
{
	int a,b;
	while((scanf("%d %d",&a,&b)!=EOF))
	{
		
		switch(b)
		{
		case 1:
	        printf("31\n");
			break;
		case 2:
			if((a%4==0)&&(a%100!=0)||a%400==0)
			{
				printf("29\n");
				continue;
			}
			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;
}