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三组数据

Posted by speedcell4 at 2012-04-09 21:19:08 on Problem 3683 
2
08:00 09:00 30
08:15 09:00 20

2
08:00 09:00 30
08:00 09:00 30

3
08:00 09:00 20
08:20 09:00 20
08:40 09:00 20

ans:
YES
08:00 08:30
08:40 09:00

YES
08:00 08:30
08:30 09:00

YES
08:00 08:20
08:20 08:40
08:40 09:00
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