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Remark: To make this code compile with Swift 4 (or later), just replace the line

swap(&a[pivotIndex], &a[i])

with

a.swapAt(pivotIndex, i)

I recently answered a question on Stack Overflow about finding the k-largest element in an array, and present my implementation of the Quickselect algorithm in Swift for review.

I recently answered a question on Stack Overflow about finding the k-largest element in an array, and present my implementation of the Quickselect algorithm in Swift for review.