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Discussion of Problem 1966. Cycling Roads

IgorKoval [PskovSU] To admins. Please, add this test. =) [1] // Problem 1966. Cycling Roads 13 Jul 2013 03:35
One of my AC solution get AC, but on this test get answer "NO". (Correct answer is "YES").
4 2
-30000 -30000
30000 -30000
30000 30000
-30000 30000
1 3
4 2
почему ответ нет?