题解：BC54 获得月份天数

```#include<stdio.h>
int main()
{
    int year,month,day;
    while(scanf("%d%d",&year,&month)!=EOF)
    {
        if(year%4==0&&year%100!=0||year%400==0)
        {
            if(month==2)
                printf("29\n");
            else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
                printf("31\n");
            else
                printf("30\n");
        }
        else
        {
            if(month==2)
                printf("28\n");
            else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
                printf("31\n");
            else
                printf("30\n");
        }
    }
}

简单粗暴，前后直接复制，所以代码看起来有点长度