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PKU v. THU (Preliminary Round 2)
Time Limit: 4 s
Memory Limit: 512 MB
Total points: 100
# 4144. 基站建设
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The problem was used in the following contest:
2012 山东省队第二轮选拔赛 (SDOI 2012 Round 2) Day 1
TL: 13s → 4s
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