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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 512 MB
# 6649. 那些脑海里最珍贵的
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The problem was used in the following contest:
2023 清华大学学生程序设计竞赛暨高校邀请赛(THUPC 2023)决赛
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