题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int y, m;
    int arr[12]={31,28,31,30,31,30,31,31,30,31,30,31};
    while (scanf("%d %d", &y, &m) != EOF) 
    {
        if(y%400==0||(y%4==0&&y%100!=0))
        arr[1]=arr[1]+1;
        printf("%d\n",arr[m-1]);
       if(y%400==0||(y%4==0&&y%100!=0))
        arr[1]=arr[1]-1;
    }
    return 0;
}