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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 15 s
Memory Limit: 512 MB
# 3035. Ghost
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题解
The problem was used in the following contest:
The 2019 Polish Collegiate Programming Contest (AMPPZ 2019)
XX Open Cup named after E.V. Pankratiev. Grand Prix of Poland
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