26 lines
779 B
Python
26 lines
779 B
Python
"""
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Author: Wenru Dong
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"""
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from typing import List
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def eight_queens() -> None:
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solutions = []
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def backtracking(queens_at_column: List[int], index_sums: List[int], index_diffs: List[int]) -> None:
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row = len(queens_at_column)
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if row == 8:
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solutions.append(queens_at_column)
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return
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for col in range(8):
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if col in queens_at_column or row + col in index_sums or row - col in index_diffs: continue
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backtracking(queens_at_column + [col], index_sums + [row + col], index_diffs + [row - col])
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backtracking([], [], [])
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print(*(" " + " ".join("*" * i + "Q" + "*" * (8 - i - 1) + "\n" for i in solution) for solution in solutions), sep="\n")
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if __name__ == "__main__":
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eight_queens()
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