题解 | #获得月份天数#

#include <stdio.h>

int main() 
{
    int y=0;
    int m=0;
    int arr1[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int arr2[13]={0,31,29,31,30,31,30,31,31,30,31,30,31};

    while(scanf("%d%d",&y,&m)==2)
    {
        if(y%4==0&&y%100!=0||y%400==0)
        {
            printf("%d\n",arr2[m]);
        }
        else
        {
            printf("%d\n",arr1[m]);

        }
    }
    return 0;
}