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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 256 MB
# 5042. Flow
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Custom Test
The problem was used in the following contest:
The 2019 ICPC Asia East Continent Final Contest (EC-Final 2019)
XX Open Cup named after E.V. Pankratiev, Grand Prix of Xi'an
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