core/org.gnit.lucenekmp.util/Selector/select

select

abstract fun select(from: Int, to: Int, k: Int)

Reorder elements so that the element at position k is the same as if all elements were sorted and all other elements are partitioned around it: [from, k) only contains elements that are less than or equal to k and (k, to) only contains elements that are greater than or equal to k.