// STL5.cp
#include <iostream>
#include <map>

int main()
{
	int	integers[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
	std::string	intNames[] = {"zero", "one", "two", "three",
						"four", "five", "six", "seven",
						"eight", "nine", "ten"};
	typedef	std::map<int, std::string> MyMap;
	typedef	std::vector<int> MyVector;
	MyMap	m;
	for (int i = 0; i < 11; ++i)
	{
		m.insert(MyMap::value_type(integers[i], intNames[i]));
	}
	MyVector lhs(integers, integers + 11), rhs(integers, integers + 11);
	std::random_shuffle(lhs.begin(), lhs.end());
	std::random_shuffle(rhs.begin(), rhs.end());
	for (int j = 0; j < 11; ++j)
	{
		int sum = lhs[j] + rhs[j];
		int diff = lhs[j] - rhs[j];
		if (sum < 11)
		{
			std::cout << m[lhs[j]] << " + " << m[rhs[j]] <<
					" = " << m[sum] << std::endl;
		}
		if (diff >= 0)
		{
			std::cout << m[lhs[j]] << " - " << m[rhs[j]] <<
					" = " << m[diff] << std::endl;
		}
	}
}
// two + zero = two
// two - zero = two
// eight - five = three
// nine + one = ten
// nine - one = eight
// three + two = five
// three - two = one
// one + four = five
// ten - ten = zero
// zero + seven = seven
// seven + three = ten
// seven - three = four