示例#1
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 def test(self):
   self.assertEqual(gcd_recur(0, 2), 2)
示例#2
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 def test(self):
   self.assertEqual(gcd_recur(4, 0), 4)
示例#3
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 def test(self):
   self.assertEqual(gcd_recur(49, -21), 7)
示例#4
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 def test(self):
   self.assertEqual(gcd_recur(5, 13), 1)