For you, Hermanita

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"I remember the machines Killjoy made. What they did to -...never mind, it doesn't matter!" — Reyna Reyna's sister died of Killjoy's machines, but in parallel world she is alive! Viper is about to experiment her new poison on her. In order to save her, Reyna must defeat Viper in the following game. A pile-pair is described as a pair of piles of stones $\{ X,Y\}$ where the first and second

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solution.cppC++17

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