Please explain

Правка en1, от ShockProof, 2015-06-30 21:08:02

got Wrong answer on test 11 after rejudge 11857092

later just printed two digits after decimal point and got Accepted 11868319

I don't understand the reason... please explain

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en1 Английский ShockProof 2015-06-30 21:08:02 228 Initial revision (published)