题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int year, month;
    int arr[]={0,31,28,31,30,31,30,31,31,30,31,30,31};//数组下标对应月份
    while (scanf("%d %d", &year, &month) != EOF) { // 注意 while 处理多个 case
        // 64 位输出请用 printf("%lld") to 
     if(year%400==0&&month==2)
        arr[2]=29;
    else if(year%100!=0&&year%4==0&&month==2)
        arr[2]=29;
    else
        arr[2] =28;
    printf("%d\n",arr[month]);
    }
    return 0;
}