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Problem link. English statement.
It appears that this problem is a strictly harder version of 2227H - Fallen Leaves. Given that this problem was published in October 2025, is this overlap intentional or accidental? Furthermore, will this round be made unrated as a result?
Congratulations! The 9th grader JDScript0117 scored a perfect 400 (full score) in the 2025 NOIP (National Olympiad in Informatics in Provinces). This year's problems were more challenging than before, but he still AKed the contest. By the way, he reached Legendary Grandmaster last month.
You can check out the problems on Luogu.
Apologies for my poor English.
