This is the strategy to avoid the need of a backtracking algorithm.
这是策略，避免了回溯算法的需要。
Eight queens problem is an ancient and well-known problem, backtracking algorithm is a typical example.
八皇后问题，是一个古老而著名的问题，是回溯算法的典型例题。
Eight queens problem is an ancient and well-known problem, backtracking algorithm is a typical example.
八皇后问题，是一个古老而著名的问题，是回溯算法的典型例题。
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