题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int a, b;
    int i;
    int arr1[] = {1, 3, 5, 7, 8, 10, 12};
    int arr2[] = {4, 6, 9, 11};
    while (scanf("%d%d", &a, &b) != EOF) {
        for (i = 0; i <= 6; i++) {
            if (b == arr1[i]) {
                printf("31\n");
            } else if (b == arr2[i]) {
                printf("30\n");
            }
        }
        if (b == 2) {
		  //闰年和平年只有2月有区别
            if (a % 400 == 0 || (a % 4 == 0 && a % 100 != 0)) {
                printf("29\n");
            } else {
                printf("28\n");
            }
        }

    }

    return 0;
}