12350 - Queen Game

All about problems in Volume 123. If there is a thread about your problem, please use it. If not, create one with its number in the subject.

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tzupengwang
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12350 - Queen Game

Post by tzupengwang »

Can anyone give a hint on how to solve the problem??
C is up to 10^15.Is there a math solution or there's a quick algorithm?
:)
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