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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 5 s
Memory Limit: 512 MB
# 1850. Magic Box
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自定义测试
The problem was used in the following contest:
Petrozavodsk Summer 2021. Day 4. Shanghai ICPC Camp 2021 Onsite Day 1 by PKU
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