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PKU v. THU (Preliminary Round 2)
Time Limit: 10 s
Memory Limit: 1024 MB
Total points: 100
# 6177. 外星飞碟问题
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Custom Test
The problem was used in the following contest:
2021 福建省队选拔赛 Day 2 (FJOI 2021 Day 2)
2021 河北省队选拔赛·补测
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