文件名称:the-question-of-N-empress
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在N*N的方格棋盘放置了N个皇后，使得它们不相互攻击（即任意2个皇后不允许处在同一排，同一列，也不允许处在与棋盘边框成45角的斜线上。
你的任务是，对于给定的N，求出有多少种合法的放置方法。 -Placed in the N* N the checkerboard N queen, so they don t attack each other (i.e. any two queen is not allowed in the same row, same column, are not allowed in and board fr a me 45 Angle diagonal lines.
Your task is to, for a given N, find out how many kinds of legal placement method.
你的任务是，对于给定的N，求出有多少种合法的放置方法。 -Placed in the N* N the checkerboard N queen, so they don t attack each other (i.e. any two queen is not allowed in the same row, same column, are not allowed in and board fr a me 45 Angle diagonal lines.
Your task is to, for a given N, find out how many kinds of legal placement method.
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