最大公約数

ユークリッドの互除法

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      "#\u30e6\u30fc\u30af\u30ea\u30c3\u30c9\u306e\u4e92\u9664\u6cd5(\u6700\u5927\u516c\u7d04\u6570)"
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      "def gcd(a, b):\n",
      "    while b: a, b = b, a % b\n",
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      "%time gcd(12, 18)"
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        "Wall time: 0 ns\n"
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        "6"
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http://nbviewer.ipython.org/gist/Tsutomu-KKE/ef8d87d39c820744431f