gistfile1.txt

#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;
//-------------------------------------------------------------------------------------
inline void error(const string& s)
{
	throw runtime_error(s);
}
//-------------------------------------------------------------------------------------
int max_value = 99;
int min_value = 1;
int year = 2;
int day = 1;
int month = 0;
//-------------------------------------------------------------------------------------
struct user_date {
	int year;
	int day;
	int month;
	void print_ambiguous() {
		cout << "ambiguous" << endl;
	}
	void print_date() {
		cout << month << "/" << day << "/"  << year << endl;
	}
	user_date(int x, int y, int z) : year(x), day(y), month(z) {}
};
//-------------------------------------------------------------------------------------
int number_input() {
	int x;
	while (!(cin >> x)) {
		cin.clear();
		cin.ignore();
		error("Wrong input. Please, try again");
	}

	if (x > max_value || x < min_value) {
		error("value out range");
	}
	return x;
}
//-------------------------------------------------------------------------------------
int main() {
	while (true) {
		try {
			vector<int> month_table = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; // table of valid days in months
			vector<int> user_numbers = { 0, 0, 0 }; //user input template
			for (int i = 0; i < user_numbers.size(); ++i) { 
				user_numbers[i] = number_input();
			}
			sort(user_numbers.begin(), user_numbers.end()); 

			user_date u(user_numbers[year], user_numbers[day], user_numbers[month]);

			int current_day_max = month_table[u.month - 1];

			if (u.month > month_table.size()) error("month out range");
			else if (u.day > current_day_max) error("day out range ");

			if (u.year > current_day_max) {
				if (u.day == u.month || u.day > month_table.size()) u.print_date();
				else u.print_ambiguous();
			}
			else if (u.year == u.day && u.day > month_table.size()) {
				u.print_date();
			}
			else u.print_ambiguous();
		}
		catch (exception& e) {
			cin.clear();
			cin.ignore();
			cerr << "exception: " << e.what() << endl;
		}
		catch (...) {
			cin.clear();
			cin.ignore();
			cerr << "unknown error" << endl;
		}
	}
}