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Hack!
Day 1
Day 2
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Time Limit: 5 s
Memory Limit: 512 MB
Total points: 100
# 2866. 遗忘的集合
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Editorial
The problem was used in the following contest:
2017 山东省队第二轮选拔赛 (SDOI 2017 Round 2) Day 2
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