#include <stdio.h> int main() { int year = 0; int month = 0; while (scanf("%d %d", &year, &month) != EOF) { int arr[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { ...