D. Nezzar and Board - Codeforces Round #698 (Div. 2)
D. Nezzar and Board https://codeforces.com/contest/1478/problem/D 題解 題意為給出一個序列xi，你可以任意挑選兩個數x，y將2·x-y加入序列中，詢問在是否可以在序列中發現數k。 假設我們任意挑選4個數：x，y，p，q ...
原文：Codeforces Round #637 (Div. 2) D. Nastya and Scoreboard
題意：一個n個數碼位的分數板，每一個數碼位都是一個七段數碼管，現在給出每個數碼位的顯示情況，問再點亮k段數碼管的話能顯示的最大的數是多少，如果不能構成一串數字，就輸出 . 答案允許有前導 ，但是有前導 的時候答案長度必須要跟n一致 原題鏈接：https: codeforces.ml contest problem D 開始感覺是貪心去爆搜，但是顯然這會T，所以想了幾分鍾后就果斷放棄了爆搜的想法。后 ...
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