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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 256 MB
Total points: 100
# 6241. 排列
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The problem was used in the following contest:
2018 安徽省队选拔赛 (AHOI 2018) Day 2
2018 湖南省队选拔赛 (HNOI 2018) Day 2
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