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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 256 MB
# 2055. Blackboard
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(Русский)
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Custom Test
The problem was used in the following contest:
The 2016 ICPC East Siberian Subregional Contest
XVII Open Cup named after E.V. Pankratiev. Eastern Grand Prix. Div 2
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