After the end of contest,Can you provide us facility to find the test case with wrong output?

Most of us face the problem of getting wrong answer when we submit the code though it is tested with many test cases on our system.
After the end of the contest,if we have a facility which tells us the test case for which our code is giving wrong output, I think it would be helpful to us to improve our code.

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Take a look at this link :

During the contest,they should not provide it but they should provide this facility at least after the contest so that we can try it again rather than leaving it…!