01. Clock

#include <iostream>
using namespace std;
int main()
{
	//часове: 0 до 23
	for (int hour = 0; hour <= 23; hour++)
	{
		//минути: 0 до 59
		for (int minute = 0; minute <= 59; minute++)
		{
			cout << hour << ":" << minute << endl;
		}
	}
}