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Hack!
Day 1
Day 2
Live
Time Limit: 4 s
Memory Limit: 512 MB
# 1833. Deleting
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题解
The problem was used in the following contest:
Petrozavodsk Summer 2021. Day 3. IQ test by kefaa2, antontrygubO_o, and gepardo
XXII Open Cup named after E.V. Pankratiev, Grand Prix of IMO
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