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PKU v. THU (Preliminary Round 2)
Time Limit: 3 s
Memory Limit: 2048 MB
# 7690. A Pivotal Question
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The problem was used in the following contest:
The 2023 ICPC East Central NA Regional Contest
The 2023 ICPC Northeast North America Regional Contest
The 2023 ICPC Greater New York Regional Contest
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