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Hack!
博客
PKU v. THU (Preliminary Round 2)
Time Limit: 0.5 s
Memory Limit: 512 MB
Hackable ✓
# 4276. Balls and Holes
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自定义测试
The problem was used in the following contest:
ICPCCamp 2015. Day 2.
Petrozavodsk Winter 2015. Day 3. Chinese Contest
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