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In this tutorial, we will write a Program to implement the Heap Sort algorithm in Kotlin programming language.

Heap sort is a comparison-based sorting technique based on the Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. We repeat the same process for the remaining elements.

Heap Sort Algorithm in Kotlin

Let's write the Kotlin program to implement the Heap sort algorithm to sort an array of elements in ascending order:

import java.util.*

fun <E: Comparable<E>> Array<E>.sort() {
    val middle = size / 2 - 1
    for (i in middle downTo 0) {
        heapify(this, size, i)
    }
    for (i in size - 1 downTo 0) {
        this[0] = this[i].also { this[i] = this[0] }
        heapify(this, i, 0)
    }
}

private fun <E: Comparable<E>> heapify(arr: Array<E>, heapSize: Int, root: Int) {
    var largest = root
    val leftNode = 2 * root + 1
    val rightNode = 2 * root + 2
    if (leftNode < heapSize && arr[leftNode] > arr[largest]) largest = leftNode
    if (rightNode < heapSize && arr[rightNode] > arr[largest]) largest = rightNode

    if (largest != root) {
        arr[root] = arr[largest].also { arr[largest] = arr[root] }
        heapify(arr, heapSize, largest)
    }
}

fun main(args: Array<String>) {
    val nums = arrayOf(2, 12, 89, 23, 76, 43, 12)
    nums.sort()
    println(Arrays.toString(nums))

    val languages = arrayOf("Kotlin", "Java", "C#", "R", "Python", "Scala", "Groovy", "C", "C++")
    languages.sort()
    println(Arrays.toString(languages))
}

Output:

[2, 12, 12, 23, 43, 76, 89]
[C, C#, C++, Groovy, Java, Kotlin, Python, R, Scala]

Related Data Structures and Algorithms in Kotlin

Bubble Sort Algorithm in Kotlin
Heap Sort Algorithm in Kotlin
Insertion Sort Algorithm in Kotlin
Merge Sort Algorithm in Kotlin
Quick Sort Algorithm in Kotlin
Selection Sort Algorithm in Kotlin
Stack Data Structure Implementation in Kotlin
Queue Data Structure Implementation in Kotlin
Deque Implementation in Kotlin
Singly Linked List Implementation in Kotlin
Doubly Linked List Implementation in Kotlin
Circular Linked List Implementation in Kotlin

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