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54 lines
1.3 KiB
54 lines
1.3 KiB
"""
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File: hanota.py
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Created Time: 2023-07-16
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Author: krahets (krahets@163.com)
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"""
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def move(src: list[int], tar: list[int]):
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"""移動一個圓盤"""
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# 從 src 頂部拿出一個圓盤
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pan = src.pop()
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# 將圓盤放入 tar 頂部
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tar.append(pan)
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def dfs(i: int, src: list[int], buf: list[int], tar: list[int]):
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"""求解河內塔問題 f(i)"""
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# 若 src 只剩下一個圓盤，則直接將其移到 tar
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if i == 1:
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move(src, tar)
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return
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# 子問題 f(i-1) ：將 src 頂部 i-1 個圓盤藉助 tar 移到 buf
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dfs(i - 1, src, tar, buf)
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# 子問題 f(1) ：將 src 剩餘一個圓盤移到 tar
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move(src, tar)
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# 子問題 f(i-1) ：將 buf 頂部 i-1 個圓盤藉助 src 移到 tar
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dfs(i - 1, buf, src, tar)
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def solve_hanota(A: list[int], B: list[int], C: list[int]):
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"""求解河內塔問題"""
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n = len(A)
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# 將 A 頂部 n 個圓盤藉助 B 移到 C
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dfs(n, A, B, C)
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"""Driver Code"""
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if __name__ == "__main__":
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# 串列尾部是柱子頂部
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A = [5, 4, 3, 2, 1]
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B = []
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C = []
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print("初始狀態下：")
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print(f"A = {A}")
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print(f"B = {B}")
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print(f"C = {C}")
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solve_hanota(A, B, C)
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print("圓盤移動完成後：")
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print(f"A = {A}")
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print(f"B = {B}")
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print(f"C = {C}")
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