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Hack!
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PKU v. THU (Finals)
Time Limit: 12 s
Memory Limit: 256 MB
# 4521. Tree Stands / Elves
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(Open Cup)
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自定义测试
The problem was used in the following contest:
CTU Open Contest 2016
Moscow International Workshops 2016. Day 5. The Czech Grand Prix
XVII Open Cup named after E.V. Pankratiev. Czech Grand Prix
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