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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 256 MB
# 4804. Regular Expression
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自定义测试
The problem was used in the following contest:
Petrozavodsk Summer 2022. Day 2. ZJU Contest 1
2022 NowCoder Multi-University Training Contest 7
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