#include <iostream> using namespace std; #define isyear(x) ((x%4 == 0)&&(x%100 !=0)||(x%400 == 0)) bool Check(int year,int month,int day) { static int MonthDay[13][2]={0,0,31,31,28,29,31,31,30,30,31,31,30,30,31,31,31,31,30,30,31,31,30,30,31,31}; if(year<100...