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
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New Editorial for Problem #18200
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Type: Editorial
Status: Open
Posted by: ucup-team7870
Posted at:
Last updated:
图是弦图，$1\sim n$ 是完美消除序列，树上背包即可 $O(n^2)$。