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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 15 s
Memory Limit: 512 MB
# 7337. Grasshoppers
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自定义测试
The problem was used in the following contest:
ICPCCamp 2017. Day 4. Jagiellonian U Contest
Petrozavodsk Winter 2017. Day 1. Jagiellonian U Contest
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