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A. Donut Shops
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I - DZY Loves Modification--行列單獨操作+優先隊列
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Codeforces Round #624 (Div. 3)D.Three Integers
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Ozon Tech Challenge 2020 (Div.1 + Div.2, Rated, T-shirts + prizes!) A. Kuroni and the Gifts
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Codeforces Round #630 (Div. 2) D. Walk on Matrix
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【寒假CodeForces】B. Food Buying 題解
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【Codeforces Round#620 (Div. 2)】A. Two Rabbits 題解
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