Error in understanding output of div2 round 548 Problem C

Revision en1, by dunjen_master, 2019-03-21 22:40:50

Her is the link to my submission on which i got WA at pretest 11

I just uncommented the line ans=(ans+mod)%mod and it got accpeted although in the previous line i had done ans=(? -ans +mod)%mod.

Someone please explain me why did my code failed at test 11 ?


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en1 English dunjen_master 2019-03-21 22:40:50 377 Initial revision (published)