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PKU v. THU (Preliminary Round 2)
Time Limit: 4 s
Memory Limit: 512 MB
Total points: 100
# 3557. Ruins 3
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(日本語)
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The problem was used in the following contest:
The 19th Japanese Olympiad in Informatics Spring Training Camp (JOISC 2019/2020) Day 2
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