Getting a Pass in a Programming Contest

The way competitive programming works as you have a set amount of time, for this contest, it was two hours. You submit the file, like it's the single file. Then they compile it, and they hit it with test cases through standard in yes o typically, typically they'll give you two or three test cases. So if you've missed some corner case, maybe it was a limp an empty list or an empty string that you didn't take care of  it's not going to tell you what test case you've failed on. It's just going to tell you that you've failed.