開発環境
- macOS Mojave - Apple (OS)
- Emacs (Text Editor)
- Windows 10 Pro (OS)
- Visual Studio Code (Text Editor)
- Python 3.7 (プログラミング言語)
問題解決のPythonプログラミング ―数学パズルで鍛えるアルゴリズム的思考 (Srini Devadas (著)、黒川 利明 (翻訳)、オライリージャパン)の12章(ひねりを加えたバラモンの塔)、練習問題(パズル問題1)を取り組んでみる。
コード(Emacs)
Python 3
#!/usr/bin/env python3
def hanoi(ring_number: int, origin: int,
peg1: int, peg2: int, peg3: int) -> int:
num_moves = 0
if ring_number > 0:
num_moves += hanoi(ring_number - 1, origin, peg1, peg3, peg2)
print(
f'Move ring {ring_number + origin} from peg {peg1} to peg {peg3}')
num_moves += 1
num_moves += hanoi(ring_number - 1, origin, peg2, peg1, peg3)
return num_moves
def hanoi_four_peg(ring_number: int,
peg1: int, peg2: int, peg3: int, peg4: int) -> int:
num_moves = 0
if ring_number > 0:
num_moves += hanoi(ring_number // 2, 0, peg1, peg2, peg4)
origin = ring_number // 2
num_moves += hanoi(ring_number // 2, origin, peg1, peg2, peg3)
num_moves += hanoi(ring_number // 2, 0, peg4, peg1, peg3)
return num_moves
if __name__ == '__main__':
num = hanoi_four_peg(8, 1, 2, 3, 4)
print(num, num == 45)
入出力結果(Terminal, cmd(コマンドプロンプト), Jupyter(IPython))
$ ./sample1.py Move ring 1 from peg 1 to peg 2 Move ring 2 from peg 1 to peg 4 Move ring 1 from peg 2 to peg 4 Move ring 3 from peg 1 to peg 2 Move ring 1 from peg 4 to peg 1 Move ring 2 from peg 4 to peg 2 Move ring 1 from peg 1 to peg 2 Move ring 4 from peg 1 to peg 4 Move ring 1 from peg 2 to peg 4 Move ring 2 from peg 2 to peg 1 Move ring 1 from peg 4 to peg 1 Move ring 3 from peg 2 to peg 4 Move ring 1 from peg 1 to peg 2 Move ring 2 from peg 1 to peg 4 Move ring 1 from peg 2 to peg 4 Move ring 5 from peg 1 to peg 2 Move ring 6 from peg 1 to peg 3 Move ring 5 from peg 2 to peg 3 Move ring 7 from peg 1 to peg 2 Move ring 5 from peg 3 to peg 1 Move ring 6 from peg 3 to peg 2 Move ring 5 from peg 1 to peg 2 Move ring 8 from peg 1 to peg 3 Move ring 5 from peg 2 to peg 3 Move ring 6 from peg 2 to peg 1 Move ring 5 from peg 3 to peg 1 Move ring 7 from peg 2 to peg 3 Move ring 5 from peg 1 to peg 2 Move ring 6 from peg 1 to peg 3 Move ring 5 from peg 2 to peg 3 Move ring 1 from peg 4 to peg 1 Move ring 2 from peg 4 to peg 3 Move ring 1 from peg 1 to peg 3 Move ring 3 from peg 4 to peg 1 Move ring 1 from peg 3 to peg 4 Move ring 2 from peg 3 to peg 1 Move ring 1 from peg 4 to peg 1 Move ring 4 from peg 4 to peg 3 Move ring 1 from peg 1 to peg 3 Move ring 2 from peg 1 to peg 4 Move ring 1 from peg 3 to peg 4 Move ring 3 from peg 1 to peg 3 Move ring 1 from peg 4 to peg 1 Move ring 2 from peg 4 to peg 3 Move ring 1 from peg 1 to peg 3 45 True $
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