Wrong test case

how can i inform CodeChef if there is an error in test cases of a problem from ongoing contest ?

Are you sure? From ongoing, I assume long challenge but every problem has atleast 5 submissions so I don’t think test cases would be wrong.
Still if you think test cases are wrong, just write it in the comments sections, the admin would take action.

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actually ,my solution got accepted for 100 points for a problem but my solution’s output for some custom test cases are wrong .

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Oh, yeah just drop a comment and it’ll be visible to the admin. Thanks for making the community better :slight_smile:

That means test cases are weak(not wrong). It happens, it is difficult to make strong test cases.