public void Test1()
{
int n = 9;
int[] testArr = new int[] { 10, 20, 20, 10, 10, 30, 50, 10, 20 };
Program p = new Program();
int actual = p.FindMatchingPairsOfSocks(n, testArr);
int expected = 3;
Assert.Equal(expected, actual);
}
