图是弦图，$1\sim n$ 是完美消除序列，树上背包即可 $O(n^2)$。
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Discussion #1946 for Problem #18200. Alternative Accounts 2
Type: Editorial
Status: Open
Posted by: ucup-team7870
Posted at: 2026-06-16 15:18:32
Last updated: 2026-06-16 15:18:52
New Editorial for Problem #18200
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