Vitya is studying in the third grade. During the last math lesson all the pupils wrote on arithmetic quiz. Vitya is a clever boy, so he managed to finish all the tasks pretty fast and Oksana Fillipovna gave him a new one, that is much harder.Vitya is studying in the third grade. During the l
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Codeforces Round #342 (Div. 2) D. Finals in arithmetic（想法题/构造题）
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