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PKU v. THU (Preliminary Round 2)
Time Limit: 5 s
Memory Limit: 1024 MB
Hackable ✓
# 6513. Expression 3
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The problem was used in the following contest:
第八届中国大学生程序设计竞赛总决赛（CCPC Final 2022）
The 1st Universal Cup. Stage 17: Guangzhou
This problem is prepared by
bulijiojiodibuliduo
.
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