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While we're at it, align title formatting with the format used in the title of the submission time.
The submission page shows a warning
The problem's testcases have changed since this judging has been performed. We recommend rejudging the whole problem.
but this warning does not cover all possible changes in the testcases (e.g. changing input / output files does not trigger this warning). Update to use the hashes to cover more cases.
Fixes #2764