题解 | #获得月份天数#

#include <stdio.h>

// 平年每年每月的天数
int days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int getDays(int year, int month)
{
    if (month != 2) return days[month];
    else
    {
        int leap = ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0);
        return 28 + leap;
    }
}

int main()
{
    int year, day;
    while (scanf("%d %d", &year, &day) != EOF)
    {
        int res = getDays(year, day);

        printf("%d\n", res);
    }

    return 0;
}