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PKU v. THU (Preliminary Round 2)
Time Limit: 1.0 s
Memory Limit: 256 MB
Hackable ✓
# 9307. Clock Master
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The problem was used in the following contest:
第六届中国大学生程序设计竞赛 威海站（CCPC 2020 Weihai）
XXI Open Cup named after E.V. Pankratiev, Grand Prix of Weihai
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