public static void Test() { Solution s = new Solution(); int[] a4 = new[] { 1, 2, 3, 4 }; a4.PrintList(); Console.WriteLine(s.LargestTimeFromDigits(a4) + " is 23:41"); int[] a = new[] { 5, 5, 5, 5 }; a.PrintList(); Console.WriteLine(s.LargestTimeFromDigits(a) + " is \"\""); int[] a2 = new[] { 2, 3, 5, 9 }; a2.PrintList(); Console.WriteLine(s.LargestTimeFromDigits(a2) + " is 23:59"); int[] a6 = new[] { 0, 0, 0, 0 }; a6.PrintList(); Console.WriteLine(s.LargestTimeFromDigits(a6) + " is \"\""); }