4. GCD
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Input
Goal output
Your output
  • 6, 9
    3
    1
  • 12, 18
    6
    1
  • 17, 13
    1
    1
  • 0, 5
    5
    1
  • 5, 0
    5
    1
  • 48, 18
    6
    1
  • -21, 14
    7
    1
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