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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