题解 | 获得月份天数

#include <stdio.h>

int main() {  
    int yy,mm;
    while(scanf("%d %d",&yy,&mm)!=EOF)
    {
      if(mm==2&&(yy % 400 == 0 || yy % 4 == 0 && yy % 100 != 0))
      {
          printf("29\n");
      }
      else
      {
       int arr[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
       printf("%d\n",arr[mm]);
      }
    }
    return 0;
}