Find k largest elements in array
Here given code implementation process.
//C Program
//Find k largest elements in array
#include <stdio.h>
//Swap two element in array
void swap(int arr[],int first,int second)
{
int temp=arr[first];
arr[first]=arr[second];
arr[second]=temp;
}
//Check the properties of max heap
int compare(int arr[],int left,int right,int root,int size)
{
int location = -1;
if(left < size && arr[left] > arr[root] )
{
if(right < size && arr[right] > arr[left])
{
swap(arr,right,root);
location = right;
}
else
{
swap(arr,left,root);
location = left;
}
}
else if(right < size && arr[right] > arr[root])
{
swap(arr,right,root);
location = right;
}
return location;
}
//Perform max heap sort
void heap(int arr[],int size,int root)
{
//Get location of left and right child
int left = 2*root+1;
int right = 2*root+2;
int next_in = compare(arr, left, right, root, size);
if(next_in != -1)
{
//When array is modified then check other array elements
heap(arr,size,next_in);
}
}
//Display array elements
void print_data(int arr[],int size)
{
printf("\n");
for(int i = 0; i < size; i++)
{
printf("%3d",arr[i] );
}
}
//Finding the all k largest element in array
void k_largest(int arr[],int size,int k)
{
if(k>size)
{
return;
}
//Auxiliary memory that will be used to store array elements
int auxiliary[size];
//set initial values into the auxiliary array
for (int i = 0; i < size; ++i)
{
auxiliary[i] = arr[i];
}
for (int i = (size/2)-1; i >= 0; i--)
{
heap(auxiliary,size,i);
}
for (int i = size-1; i >= (size-1 -k); i--)
{
//Swap large element at the end
swap(auxiliary, 0, i);
heap(auxiliary, i, 0);
}
printf("\n %d Largest Element \n",k);
//Display resultant elements
for (int i = size-1; i >= size-k; --i)
{
printf(" %d",auxiliary[i] );
}
printf("\n");
}
int main()
{
//Define collection of array elements
int arr[] = {6, 8, 2, 7,14, 1, 3, 8, 21, 11, 12 ,5};
//Get the size of array
int size = sizeof(arr)/sizeof(arr[0]);
//number of largest element
int k=3;
print_data(arr,size);
k_largest(arr,size,k);
return 0;
}
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12/*
C++ Program
Find k largest elements in array
*/
#include<iostream>
using namespace std;
class MyHeap {
public:
//Swap two element in array
void swap(int arr[], int first, int second) {
int temp = arr[first];
arr[first] = arr[second];
arr[second] = temp;
}
//Check the properties of max heap
int compare(int arr[], int left, int right, int root, int size) {
int location = -1;
if (left < size && arr[left] > arr[root]) {
if (right < size && arr[right] > arr[left]) {
this->swap(arr, right, root);
location = right;
} else {
this->swap(arr, left, root);
location = left;
}
} else
if (right < size && arr[right] > arr[root]) {
this->swap(arr, right, root);
location = right;
}
return location;
}
//Perform max heap sort
void heap(int arr[], int size, int root) {
//Get location of left and right child
int left = 2 *root + 1;
int right = 2 *root + 2;
int next_in = this->compare(arr, left, right, root, size);
if (next_in != -1) {
//When array is modified then check other array elements
this->heap(arr, size, next_in);
}
}
//Display array elements
void print_data(int arr[], int size) {
for (int i = 0; i < size; i++) {
cout << " " << arr[i];
}
cout << "\n";
}
//Finding the all k largest element in array
void k_largest(int arr[], int size, int k) {
if (k > size) {
return;
}
//Auxiliary memory that will be used to store array elements
int *auxiliary = new int[size];
//set initial values into the auxiliary array
for (int i = 0; i < size; ++i) {
auxiliary[i] = arr[i];
}
for (int i = (size / 2) - 1; i >= 0; i--) {
this->heap(auxiliary, size, i);
}
for (int i = size - 1; i >= (size - 1 - k); i--) {
//Swap large element at the end
this->swap(auxiliary, 0, i);
this->heap(auxiliary, i, 0);
}
cout << " " << k << " Largest Element \n";
//Display resultant elements
for (int i = size - 1; i >= size - k; --i) {
cout << " " << auxiliary[i];
}
cout << "\n";
}
};
int main() {
MyHeap obj = MyHeap();
int arr[] = {
6,
8,
2,
7,
14,
1,
3,
8,
21,
11,
12,
5
};
//Get the size of array
int size = sizeof(arr) / sizeof(arr[0]);
//Number of largest element
int k = 3;
//Display array elements
obj.print_data(arr, size);
obj.k_largest(arr, size, k);
return 0;
}
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12/*
Java Program
Find k largest elements in array
*/
public class MyHeap {
//Swap two element in array
public void swap(int []arr,int first,int second)
{
int temp=arr[first];
arr[first]=arr[second];
arr[second]=temp;
}
//Check the properties of max heap
public int compare(int []arr,int left,int right,int root,int size)
{
int location = -1;
if(left < size && arr[left] > arr[root] )
{
if(right < size && arr[right] > arr[left])
{
swap(arr,right,root);
location = right;
}
else
{
swap(arr,left,root);
location = left;
}
}
else if(right < size && arr[right] > arr[root])
{
swap(arr,right,root);
location = right;
}
return location;
}
//Perform max heap sort
public void heap(int []arr,int size,int root)
{
//Get location of left and right child
int left = 2*root+1;
int right = 2*root+2;
int next_in = compare(arr, left, right, root, size);
if(next_in != -1)
{
//When array is modified then check other array elements
heap(arr,size,next_in);
}
}
//Display array elements
public void print_data(int []arr,int size)
{
for(int i = 0; i < size; i++)
{
System.out.print(" "+arr[i] );
}
System.out.print("\n");
}
//Finding the all k largest element in array
public void k_largest(int []arr,int size,int k)
{
if(k>size)
{
return;
}
//Auxiliary memory that will be used to store array elements
int []auxiliary= new int[size];
//set initial values into the auxiliary array
for (int i = 0; i < size; ++i)
{
auxiliary[i] = arr[i];
}
for (int i = (size/2)-1; i >= 0; i--)
{
heap(auxiliary,size,i);
}
for (int i = size-1; i >= (size-1 -k); i--)
{
//Swap large element at the end
swap(auxiliary, 0, i);
heap(auxiliary, i, 0);
}
System.out.print(" "+k+" Largest Element \n");
//Display resultant elements
for (int i = size-1; i >= size-k; --i)
{
System.out.print(" "+auxiliary[i] );
}
System.out.print("\n");
}
public static void main(String[] args) {
MyHeap obj = new MyHeap();
//Define Collection of array elements
int []arr = {6, 8, 2, 7,14, 1, 3, 8, 21, 11, 12 ,5};
//Get the size of array
int size = arr.length;
//Number of largest element
int k=3;
//Display array elements
obj.print_data(arr,size);
obj.k_largest(arr,size,k);
}
}
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12/*
C# Program
Find k largest elements in array
*/
using System;
public class MyHeap {
//Swap two element in array
public void swap(int[] arr, int first, int second) {
int temp = arr[first];
arr[first] = arr[second];
arr[second] = temp;
}
//Check the properties of max heap
public int compare(int[] arr, int left, int right, int root, int size) {
int location = -1;
if (left < size && arr[left] > arr[root]) {
if (right < size && arr[right] > arr[left]) {
swap(arr, right, root);
location = right;
} else {
swap(arr, left, root);
location = left;
}
} else
if (right < size && arr[right] > arr[root]) {
swap(arr, right, root);
location = right;
}
return location;
}
//Perform max heap sort
public void heap(int[] arr, int size, int root) {
//Get location of left and right child
int left = 2 * root + 1;
int right = 2 * root + 2;
int next_in = compare(arr, left, right, root, size);
if (next_in != -1) {
heap(arr, size, next_in);
}
}
//Display array elements
public void print_data(int[] arr, int size) {
for (int i = 0; i < size; i++) {
Console.Write(" " + arr[i]);
}
Console.Write("\n");
}
//Finding the all k largest element in array
public void k_largest(int[] arr, int size, int k) {
if (k > size) {
return;
}
int[]
//Auxiliary memory that will be used to store array elements
auxiliary = new int[size];
//set initial values into the auxiliary array
for (int i = 0; i < size; ++i) {
auxiliary[i] = arr[i];
}
for (int i = (size / 2) - 1; i >= 0; i--) {
heap(auxiliary, size, i);
}
for (int i = size - 1; i >= (size - 1 - k); i--) {
swap(auxiliary, 0, i);
heap(auxiliary, i, 0);
}
Console.Write(" " + k + " Largest Element \n");
//Display resultant elements
for (int i = size - 1; i >= size - k; --i) {
Console.Write(" " + auxiliary[i]);
}
Console.Write("\n");
}
public static void Main(String[] args) {
MyHeap obj = new MyHeap();
int[]
//Define Collection of array elements
arr = {
6,
8,
2,
7,
14,
1,
3,
8,
21,
11,
12,
5
};
//Get the size of array
int size = arr.Length;
//Number of largest element
int k = 3;
obj.print_data(arr, size);
obj.k_largest(arr, size, k);
}
}
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12<?php
/*
Php Program
Find k largest elements in array
*/
class MyHeap {
//Swap two element in array
public function swap(&$arr, $first, $second) {
$temp = $arr[$first];
$arr[$first] = $arr[$second];
$arr[$second] = $temp;
}
//Check the properties of max heap
public function compare(&$arr, $left, $right, $root, $size) {
$location = -1;
if ($left < $size && $arr[$left] > $arr[$root]) {
if ($right < $size && $arr[$right] > $arr[$left]) {
$this->swap($arr, $right, $root);
$location = $right;
} else {
$this->swap($arr, $left, $root);
$location = $left;
}
} else
if ($right < $size && $arr[$right] > $arr[$root]) {
$this->swap($arr, $right, $root);
$location = $right;
}
return $location;
}
//Perform max heap sort
public function heap(&$arr, $size, $root) {
//Get location of left and right child
$left = 2 *$root + 1;
$right = 2 *$root + 2;
$next_in = $this->compare($arr, $left, $right, $root, $size);
if ($next_in != -1) {
//When array is modified then check other array elements
$this->heap($arr, $size, $next_in);
}
}
//Display array elements
public function print_data($arr, $size) {
for ($i = 0; $i < $size; $i++) {
echo(" ". $arr[$i]);
}
echo("\n");
}
//Finding the all k largest element in array
public function k_largest($arr, $size, $k) {
if ($k > $size) {
return;
}
//Auxiliary memory that will be used to store array elements
$auxiliary = array_fill(0, $size, 0);
//set initial values into the auxiliary array
for ($i = 0; $i < $size; ++$i) {
$auxiliary[$i] = $arr[$i];
}
for ($i = (intval($size / 2)) - 1; $i >= 0; $i--) {
$this->heap($auxiliary, $size, $i);
}
for ($i = $size - 1; $i >= ($size - 1 - $k); $i--) {
//Swap large element at the end
$this->swap($auxiliary, 0, $i);
$this->heap($auxiliary, $i, 0);
}
echo(" ". $k ." Largest Element \n");
//Display resultant elements
for ($i = $size - 1; $i >= $size - $k; --$i) {
echo(" ". $auxiliary[$i]);
}
echo("\n");
}
}
function main() {
$obj = new MyHeap();
//Define Collection of array elements
$arr = array(6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5);
//Get the size of array
$size = count($arr);
//Number of largest element
$k = 3;
//Display array elements
$obj->print_data($arr, $size);
$obj->k_largest($arr, $size, $k);
}
main();
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12/*
Node Js Program
Find k largest elements in array
*/
class MyHeap {
//Swap two element in array
swap(arr, first, second) {
var temp = arr[first];
arr[first] = arr[second];
arr[second] = temp;
}
//Check the properties of max heap
compare(arr, left, right, root, size) {
var location = -1;
if (left < size && arr[left] > arr[root]) {
if (right < size && arr[right] > arr[left]) {
this.swap(arr, right, root);
location = right;
} else {
this.swap(arr, left, root);
location = left;
}
} else
if (right < size && arr[right] > arr[root]) {
this.swap(arr, right, root);
location = right;
}
return location;
}
//Perform max heap sort
heap(arr, size, root) {
//Get location of left and right child
var left = 2 *root + 1;
var right = 2 *root + 2;
var next_in = this.compare(arr, left, right, root, size);
if (next_in != -1) {
//When array is modified then check other array elements
this.heap(arr, size, next_in);
}
}
//Display array elements
print_data(arr, size) {
for (var i = 0; i < size; i++) {
process.stdout.write(" " + arr[i]);
}
process.stdout.write("\n");
}
//Finding the all k largest element in array
k_largest(arr, size, k) {
if (k > size) {
return;
}
//Auxiliary memory that will be used to store array elements
var auxiliary = Array(size).fill(0);
//set initial values into the auxiliary array
for (var i = 0; i < size; ++i) {
auxiliary[i] = arr[i];
}
for (var i = (parseInt(size / 2)) - 1; i >= 0; i--) {
this.heap(auxiliary, size, i);
}
for (var i = size - 1; i >= (size - 1 - k); i--) {
//Swap large element at the end
this.swap(auxiliary, 0, i);
this.heap(auxiliary, i, 0);
}
process.stdout.write(" " + k + " Largest Element \n");
//Display resultant elements
for (var i = size - 1; i >= size - k; --i) {
process.stdout.write(" " + auxiliary[i]);
}
process.stdout.write("\n");
}
}
function main(args) {
var obj = new MyHeap();
//Define Collection of array elements
var arr = [6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5];
//Get the size of array
var size = arr.length;
//Number of largest element
var k = 3;
//Display array elements
obj.print_data(arr, size);
obj.k_largest(arr, size, k);
}
main();
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12# Python 3 Program
# Find k largest elements in array
class MyHeap :
# Swap two element in array
def swap(self, arr, first, second) :
temp = arr[first]
arr[first] = arr[second]
arr[second] = temp
# Check the properties of max heap
def compare(self, arr, left, right, root, size) :
location = -1
if (left < size and arr[left] > arr[root]) :
if (right < size and arr[right] > arr[left]) :
self.swap(arr, right, root)
location = right
else :
self.swap(arr, left, root)
location = left
elif (right < size and arr[right] > arr[root]) :
self.swap(arr, right, root)
location = right
return location
# Perform max heap sort
def heap(self, arr, size, root) :
left = 2 * root + 1
right = 2 * root + 2
next_in = self.compare(arr, left, right, root, size)
if (next_in != -1) :
self.heap(arr, size, next_in)
# Display array elements
def print_data(self, arr, size) :
i = 0
while (i < size) :
print(" ", arr[i], end = "")
i += 1
print("\n", end = "")
# Finding the all k largest element in array
def k_largest(self, arr, size, k) :
if (k > size) :
return
i = 0
auxiliary = [0] * size
# set initial values into the auxiliary array
while (i < size) :
auxiliary[i] = arr[i]
i += 1
i = (int(size / 2)) - 1
while (i >= 0) :
self.heap(auxiliary, size, i)
i -= 1
i = size - 1
while (i >= (size - 1 - k)) :
self.swap(auxiliary, 0, i)
self.heap(auxiliary, i, 0)
i -= 1
print(" ", k ," Largest Element \n", end = "")
# Display resultant elements
i = size - 1
while (i >= size - k) :
print(" ", auxiliary[i], end = "")
i -= 1
print("\n", end = "")
def main() :
obj = MyHeap()
# Define Collection of array elements
arr = [6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5]
# Get the size of array
size = len(arr)
# Number of largest element
k = 3
# Display array elements
obj.print_data(arr, size)
obj.k_largest(arr, size, k)
if __name__ == "__main__":
main()
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12# Ruby Program
# Find k largest elements in array
class MyHeap
# Swap two element in array
def swap(arr, first, second)
temp = arr[first]
arr[first] = arr[second]
arr[second] = temp
end
# Check the properties of max heap
def compare(arr, left, right, root, size)
location = -1
if (left < size && arr[left] > arr[root])
if (right < size && arr[right] > arr[left])
self.swap(arr, right, root)
location = right
else
self.swap(arr, left, root)
location = left
end
elsif (right < size && arr[right] > arr[root])
self.swap(arr, right, root)
location = right
end
return location
end
# Perform max heap sort
def heap(arr, size, root)
left = 2 * root + 1
right = 2 * root + 2
next_in = self.compare(arr, left, right, root, size)
if (next_in != -1)
self.heap(arr, size, next_in)
end
end
# Display array elements
def print_data(arr, size)
i = 0
while (i < size)
print(" ", arr[i])
i += 1
end
print("\n")
end
# Finding the all k largest element in array
def k_largest(arr, size, k)
if (k > size)
return
end
i = 0
auxiliary = Array.new(size, 0)
# set initial values into the auxiliary array
while (i < size)
auxiliary[i] = arr[i]
i += 1
end
i = (size / 2) - 1
while (i >= 0)
self.heap(auxiliary, size, i)
i -= 1
end
i = size - 1
while (i >= (size - 1 - k))
self.swap(auxiliary, 0, i)
self.heap(auxiliary, i, 0)
i -= 1
end
print(" ", k ," Largest Element \n")
# Display resultant elements
i = size - 1
while (i >= size - k)
print(" ", auxiliary[i])
i -= 1
end
print("\n")
end
end
def main()
obj = MyHeap.new()
# Define Collection of array elements
arr = [6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5]
# Get the size of array
size = arr.length
# Number of largest element
k = 3
# Display array elements
obj.print_data(arr, size)
obj.k_largest(arr, size, k)
end
main()
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12
/*
Scala Program
Find k largest elements in array
*/
class MyHeap {
//Swap two element in array
def swap(arr: Array[Int], first: Int, second: Int): Unit = {
val temp: Int = arr(first);
arr(first) = arr(second);
arr(second) = temp;
}
//Check the properties of max heap
def compare(arr: Array[Int], left: Int, right: Int, root: Int, size: Int): Int = {
var location: Int = -1;
if (left < size && arr(left) > arr(root)) {
if (right < size && arr(right) > arr(left)) {
this.swap(arr, right, root);
location = right;
} else {
this.swap(arr, left, root);
location = left;
}
} else
if (right < size && arr(right) > arr(root)) {
this.swap(arr, right, root);
location = right;
}
return location;
}
//Perform max heap sort
def heap(arr: Array[Int], size: Int, root: Int): Unit = {
val left: Int = 2 * root + 1;
val right: Int = 2 * root + 2;
val next_in: Int = this.compare(arr, left, right, root, size);
if (next_in != -1) {
this.heap(arr, size, next_in);
}
}
//Display array elements
def print_data(arr: Array[Int], size: Int): Unit = {
var i: Int = 0;
while (i < size) {
print(" " + arr(i));
i += 1;
}
print("\n");
}
//Finding the all k largest element in array
def k_largest(arr: Array[Int], size: Int, k: Int): Unit = {
if (k > size) {
return;
}
var i: Int = 0;
var auxiliary: Array[Int] = Array.fill[Int](size)(0);
//set initial values into the auxiliary array
while (i < size) {
auxiliary(i) = arr(i);
i += 1;
}
i = ((size / 2).toInt) - 1;
while (i >= 0) {
this.heap(auxiliary, size, i);
i -= 1;
}
i = size - 1;
while (i >= (size - 1 - k)) {
this.swap(auxiliary, 0, i);
this.heap(auxiliary, i, 0);
i -= 1;
}
print(" " + k + " Largest Element \n");
//Display resultant elements
i = size - 1;
while (i >= size - k) {
print(" " + auxiliary(i));
i -= 1;
}
print("\n");
}
}
object Main {
def main(args: Array[String]): Unit = {
val obj: MyHeap = new MyHeap();
//Define Collection of array elements
val arr: Array[Int] = Array(6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5);
//Get the size of array
val size: Int = arr.length;
//Number of largest element
val k: Int = 3;
//Display array elements
obj.print_data(arr, size);
obj.k_largest(arr, size, k);
}
}
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12/*
Swift Program
Find k largest elements in array
*/
class MyHeap {
//Swap two element in array
func swap(_ arr: inout [Int], _ first: Int, _ second: Int) {
let temp: Int = arr[first];
arr[first] = arr[second];
arr[second] = temp;
}
//Check the properties of max heap
func compare(_ arr: inout [Int], _ left: Int, _ right: Int, _ root: Int, _ size: Int) -> Int {
var location: Int = -1;
if (left < size && arr[left] > arr[root]) {
if (right < size && arr[right] > arr[left]) {
self.swap(&arr, right, root);
location = right;
} else {
self.swap(&arr, left, root);
location = left;
}
}
else if (right < size && arr[right] > arr[root]) {
self.swap(&arr, right, root);
location = right;
}
return location;
}
//Perform max heap sort
func heap(_ arr: inout [Int], _ size: Int, _ root: Int) {
let left: Int = 2 * root + 1;
let right: Int = 2 * root + 2;
let next_in: Int = self.compare(&arr, left, right, root, size);
if (next_in != -1) {
self.heap(&arr, size, next_in);
}
}
//Display array elements
func print_data(_ arr: [Int], _ size: Int) {
var i: Int = 0;
while (i < size) {
print(" ", arr[i], terminator: "");
i += 1;
}
print("\n", terminator: "");
}
//Finding the all k largest element in array
func k_largest(_ arr: [Int], _ size: Int, _ k: Int) {
if (k > size) {
return;
}
var i: Int = 0;
var auxiliary: [Int] = Array(repeating: 0, count: size);
//set initial values into the auxiliary array
while (i < size) {
auxiliary[i] = arr[i];
i += 1;
}
i = (size / 2) - 1;
while (i >= 0) {
self.heap(&auxiliary, size, i);
i -= 1;
}
i = size - 1;
while (i >= (size - 1 - k)) {
self.swap(&auxiliary, 0, i);
self.heap(&auxiliary, i, 0);
i -= 1;
}
print(" ", k ," Largest Element \n", terminator: "");
//Display resultant elements
i = size - 1;
while (i >= size - k) {
print(" ", auxiliary[i], terminator: "");
i -= 1;
}
print(terminator: "\n");
}
}
func main() {
let obj: MyHeap = MyHeap();
//Define Collection of array elements
let arr: [Int] = [6, 8, 2, 7, 14, 1, 3, 8, 21, 11, 12, 5];
//Get the size of array
let size: Int = arr.count;
//Number of largest element
let k: Int = 3;
//Display array elements
obj.print_data(arr, size);
obj.k_largest(arr, size, k);
}
main();
Output
6 8 2 7 14 1 3 8 21 11 12 5
3 Largest Element
21 14 12
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