TwoSteps no longer works at CodinGame. If you want, you may send me your code in private message and I can take a look.
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If anyone has an issue with the 7th validator (Arbitrary indexes), the following custom case may help you in debugging your code:
Input
13
9576 5462
8040 9576
9612 8040
8040 5462
9612 5462
7943 5462
9852 8040
9852 9612
8765 9576
9431 8040
3560 8040
2289 9431
2289 5462
Output
5