Puzzleup 2021 (7) PAWNS - 拼圖
By Callum
at 2021-10-13T19:33
at 2021-10-13T19:33
Table of Contents
題目網址: https://www.puzzleup.com/2021/
https://www.puzzleup.com/2021/puzzle/?7
答題時限: 10月14日7PM-比賽結束(約11月9日)
加分時限: 10月14日7PM-10月19日6:59PM
答對可得基本分100分。答案可上傳5次,每改1次答案從基本分扣20分。
比賽期間內可隨時上傳答案,加分時限內答對第n天加(6-n)分
另依題目的難易有額外加分(如有80%的人這題答錯,答對者加80分)
◆PAWNS
N pawns are placed on a 6x6 chessboard in such a way that taking all the
pawns from any three rows and three columns will leave at least one pawn.
What is the minimum possible number of N?
N 個小兵放在 6x6 棋盤上,
使得當任選三行三列移除其上所有小兵後至少還有一個小兵留著。
試問滿足條件的最小的 N 是多少?
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