there is an issue with c#.
We should had this test
int[] peopleInLine = new int[] { 25, 25, 50, 50, 50 }; This should give "NO".
But there is solutions, tagged as best pratice and clever that answer "YES" to this test case and still pass the official test that validate their solution.

As UKS notice, this solution should not pass.
If you use the following entry :
int[] peopleInLine = new int[] { 25, 25, 50, 50, 50 };

The correct answer is "NO". When the last person want to pay; we only have 50$ bill; so we are unable to give back 25$
But, when you launch this code; it will answer "YES".

I check this code with the submite button. It really success in passing the test.
I think; it lack some test that will show that this code is failling.

For unknown reasons, when I add you code; mycode is validate with 3 successfull test.
But, without you code; I pass 8 out of 9 tests.

Some side effect of your code is that, now, we only pass the 3 firsts test. The forth one(the one failling with my code) is not executed.

Your comment confirm that the test for this excercise are bugged.

I've got this error when I submit.
But it doesn't seems to come from my code.

TestLargeRandom
SetUp : System.NullReferenceException : Object reference not set to an instance of an object
at NUnit.Core.NUnitFramework.GetResultState (System.Exception ex) <0x42051050 + 0x0004c> in :0
at NUnit.Core.TestMethod.RunTest () <0x42047ea0 + 0x0014d> in :0

Is it a problem with the test runner? Or do you think there is something in my code that can trigger this message?