Offline RMQ in linear time with union-find (Arpa's trick)

Also called Offline RMQ in linear time with DSU (Arpa's trick).

A linear-time offline method for answering range minimum queries by processing the array with a stack and union-find, using near-constant amortized merges.

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Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
Lean	L0 no Lean part	name a Lean module in the lean field (07)
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Writing	W0 stub	the section The problem pseudocode in The algorithm complexity claims in the front matter one source with a locator

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