题解 | #获得月份天数#

#include <stdio.h>

int main() {
    int y, m;
    int month[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    while (scanf("%d %d", &y, &m) != EOF) {
        if ((y % 4 == 0 && y % 100 != 0 || y % 400 == 0) && m == 2) {
            printf("%d\n", month[m] + 1);
        } else {
            printf("%d\n", month[m]);
        }
    }
    return 0;
}