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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 2 s
Memory Limit: 1024 MB
Hackable ✓
# 6551. Forever Young
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自定义测试
The problem was used in the following contest:
The 2nd Universal Cup. Stage 5: Northern
Petrozavodsk Winter 2023. Day 5: LOUD Enough Contest 2
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