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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 2 s
Memory Limit: 512 MB
# 7252. Airports
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The problem was used in the following contest:
ICPCCamp 2016. Day 7(8). Makoto Soejima's Contest #4
Petrozavodsk Winter 2016. Day 3. Makoto Soejima Contest 4
XVI Open Cup named after E.V. Pankratiev. Grand Prix of Asia
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