public void TestPentagonalNumberGenerator()
{
var expected = new[] { 1, 5, 12, 22, 35 };
var actual = PentagonalNumberGenerator.Generate().Take(5).ToArray();
Assert.AreEqual(expected.Length, actual.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.AreEqual(expected[i], actual[i]);
}
}
static void Main(string[] args)
{
var pentagonNums = PentagonalNumberGenerator.Generate().TakeWhile(n => n < 10000000).ToList();
var answer = (from p1 in pentagonNums
from p2 in pentagonNums
where p1 > p2
where pentagonNums.Contains(p1 + p2)
where pentagonNums.Contains(p1 - p2)
select p1 - p2)
.Min();
Console.WriteLine(answer);
Console.WriteLine("Done");
Console.ReadKey();
}
public void TestGeneration(int n, int expectedResult)
{
Assert.That(generator.Generate(n), Is.EqualTo(expectedResult));
}