题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int y,m,i;
    while(~scanf("%d %d",&y,&m))
    {
        if((m==2&&y%4==0)&&(y%100!=0||y%400==0))
        {
            printf("29\n");
        }
        else 
        {
            if((m<8&&m%2==1)||(m>=8&&m%2==0)) printf("31\n");
            else if (((m%2==0&&m<8)||(m>8&&m%2==1))&&m!=2) printf("30\n");
            else printf("28\n");
        }
    }return 0;
}