题目网址: http://www.puzzleup.com/2019/
http://www.puzzleup.com/2019/puzzle/?11
答题时限: 10月3日7PM-比赛结束
加分时限: 10月3日7PM-10月9日6:59PM
答对可得基本分100分。答案可上传5次,每改1次答案从基本分扣20分。
比赛期间内可随时上传答案,加分时限内答对第n天加(6-n)分
另依题目的难易有额外加分(如有80%的人这题答错,答对者加80分)
◆EIGHT QUEENS SIXTEEN SQUARES
Place eight queens on a 4x4 chessboard so that there are no more than
two queens in any row, column, or diagonal (2, 3, or 4 squares) lines.
How many different ways can this be done?
Note: Symmetrical solutions will be counted separately.
将八个皇后棋子,放置于一个4x4的棋盘上,使得每行、每列、每条斜线(两格、
三格、四格)上的皇后数量不得多于二个。问有几种不同的作法?
注:对称解视为不同解计算。