Atcoder Round 163 , Problem D

Правка en1, от alwaysGREEEN, 2020-04-20 11:04:38

I recently gave Atcoder Round 163 and could not solve this problem Can anyone explain the math behind this problem ?

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en1 Английский alwaysGREEEN 2020-04-20 11:04:38 200 Initial revision (published)