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Hack!
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PKU v. THU (Finals)
Time Limit: 1 s
Memory Limit: 1024 MB
# 5075. Fenwick Tree
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自定义测试
The problem was used in the following contest:
The 2021 ICPC Asia East Continent Final Contest (EC-Final 2021)
XXII Open Cup named after E.V. Pankratiev, Grand Prix of China
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