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:
            case 3:
            case 5:
            case 7:
            case 8: 
            case 10:
            case 12:printf("31\n"); break;
            case 4:
            case 6:
            case 9:
            case 11:printf("30\n");break;
            case 2:if(a%4==0)
                        printf("29\n");
                    else printf("28\n");break;
        }
    }
    return 0;
}