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The test data of this problem is a little weak?
By Ioser, 9 years ago, In English

problem 319E(319E - Ping-Pong). Try this data, which makes many accepted program fail:

9
1 -15 -10
1 -11 -5
1 -15 -5
2 3 1
2 1 3
2 2 1
2 1 2
2 2 3
2 3 2
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