The strange feedback of a submission made in Codeforces Round #418 (Div.2)

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The strange feedback of a submission made in Codeforces Round #418 (Div.2)

Revision en1, by Marco_L_T, 2017-06-07 18:48:01

[user:Reyna]'s submission of Problem A in today's contest got Wrong Answer verdict. However,when I looked at the detailed feedback,it showed that it couldn't find a file,which I never saw before.More strangely,I re-submitted Reyna's code and then got AC verdict.So,could anyone tell me what the reason was or it was a bug in Codeforces? Thanks!

History

Revisions

Rev.	By	When	Δ	Comment
en6	Marco_L_T	2017-06-08 03:24:50	32	Tiny change: 's? Thanks!' -> 's? Thanks!\n\nUPD: The issue is fixed now.'
en5	Marco_L_T	2017-06-07 18:51:29	4	Tiny change: 'C verdict.[Submissio' -> 'C verdict.\n\n[Submissio'
en4	Marco_L_T	2017-06-07 18:51:16	2	Tiny change: '652681) \nSo,could' -> '652681) \n\nSo,could'
en3	Marco_L_T	2017-06-07 18:50:43	70
en2	Marco_L_T	2017-06-07 18:49:23	83
en1	Marco_L_T	2017-06-07 18:48:01	544	Initial revision (published)