C++ Heapsort sort algorithm Exercise: Sort an array of elements using the Heapsort sort algorithm

Last update on April 14 2025 12:44:12 (UTC/GMT +8 hours)

8. Sort an Array Using the Heapsort Algorithm

Write a C++ program to sort an array of elements using the Heapsort sort algorithm.

Sample Solution:

C++ Code :

// Including necessary C++ libraries
#include <algorithm>
#include <iterator>
#include <iostream>

// Function to perform heap sort algorithm
template<typename RandomAccessIterator>
void heap_sort(RandomAccessIterator begin, RandomAccessIterator end) {
  // Creating a heap from the elements in the range [begin, end)
  std::make_heap(begin, end);

  // Sorting the heap by repeatedly extracting the maximum element
  std::sort_heap(begin, end);
}

// Main function
int main() {
  // Initializing an array of integers for sorting
  int a[] = {125, 0, 695, 3, -256, -5, 214, 44, 55};

  // Displaying the original numbers in the array
  std::cout << "Original numbers:\n";
  std::copy(std::begin(a), std::end(a), std::ostream_iterator<int>(std::cout, " "));
  std::cout << "\n";

  // Sorting the array using heap_sort function
  heap_sort(std::begin(a), std::end(a));

  // Displaying the sorted numbers after heap sort
  std::cout << "Sorted numbers:\n";
  std::copy(std::begin(a), std::end(a), std::ostream_iterator<int>(std::cout, " "));
  std::cout << "\n";

  // Returning 0 to indicate successful execution
  return 0;
}

Sample Output:

Original numbers:
125 0 695 3 -256 -5 214 44 55 
Sorted numbers:
-256 -5 0 3 44 55 125 214 695

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to implement heapsort and print the heap structure after each extraction.
Write a C++ program to implement heapsort with a custom comparator to sort in descending order.
Write a C++ program to build both max-heap and min-heap versions of heapsort and compare their outputs.
Write a C++ program to validate heapsort by comparing its output with STL's sort function.

C++ Code Editor:

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