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Time Limit: 1 s
Memory Limit: 512 MB
Total points: 100
# 6649. 那些脑海里最珍贵的
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The problem was used in the following contests:
2023 清华大学学生程序设计竞赛暨高校邀请赛（THUPC 2023）决赛
Petrozavodsk Winter 2025. Day 6. THird febrUary contest
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