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Update the book based on the revised second edition (#1014)

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* Revised the book

* Update the book with the second revised edition

* Revise base on the manuscript of the first edition
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Yudong Jin
2023-12-28 18:06:09 +08:00
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docs/chapter_backtracking/n_queens_problem.md
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![4 皇后问题的解](n_queens_problem.assets/solution_4_queens.png)
下图展示了本题的三个约束条件：**多个皇后不能在同一行、同一列、同一对角线**。值得注意的是，对角线分为主对角线 `\` 和次对角线 `/` 两种。
下图展示了本题的三个约束条件：**多个皇后不能在同一行、同一列、同一条对角线上**。值得注意的是，对角线分为主对角线 `\` 和次对角线 `/` 两种。
![n 皇后问题的约束条件](n_queens_problem.assets/n_queens_constraints.png)