In last two contest problem "C" was quite easy but how you guys come up to the logic?! I just cannot figured it out,Is there any good books or something which can improve my logical thinking about those math type problem? Problem link: In codecraft-20 1316C - Простые простые and in Ozon tech challenge 1305C - Невозможное вычисление
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Instead of blindly solving, try to understand the proof behind stuff and you realize the proofs for some problems are quite similar.