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Discussion of Problem 1389. Roadworks

Douglas Cardoso To admins: Test data is really, really, really weak [1] // Problem 1389. Roadworks 23 Jun 2012 00:01
Please check my submission 4323013. It gets AC although to the input
4 3
1 2
2 4
4 3

it answers
1
2 4

when the right answer is clearly
2
1 2
3 4
Your test was added, 15 authors lost AC.