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I noticed that 2149E — Subarrays with Exactly K from the just-finished contest is similar with LeetCode 992 — Subarrays with K Different Integers
The main twist here is that Codeforces adds the extra condition with [l,r] to the LeetCode version.
if you're upsolving E, I'd recommend trying LC 992 first :)
Auto comment: topic has been updated by Min_27 (previous revision, new revision, compare).