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Hack!
Time Limit: 2.5 s
Memory Limit: 1024 MB
Hackable ✓
# 7689. Flipping Cards
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Statement
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The problem was used in the following contest:
The 2nd Universal Cup. Stage 8: Guilin
第九届中国大学生程序设计竞赛 桂林站（CCPC 2023 Guilin Site）
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