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Hack!
Time Limit: 1.5 s
Memory Limit: 512 MB
Hackable ✓
# 6839. Buy and Delete
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Statement
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Custom Test
The problem was used in the following contest:
第七届中国大学生程序设计竞赛 桂林站（CCPC 2021 Guilin）
XXII Open Cup named after E.V. Pankratiev, Grand Prix of EDG
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