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  1. #include <iostream>
  2. #include <ctime>
  3. using namespace std;
  4.  
  5. int Partition(int A[], int start, int end) {
  6.     int key = A[end];
  7.     int pi = start;
  8.     for (int i = start; i < end; i++) {
  9.         if (A[i] < key) {
  10.             swap(A[i], A[pi]);
  11.             pi++;
  12.         }
  13.     }
  14.     swap(A[pi], A[end]);
  15.     return pi;
  16. }
  17.  
  18. void Quick_sort(int A[], int start, int end) {
  19.     if (start < end) {
  20.         int pi = Partition(A, start, end);
  21.         Quick_sort(A, start, pi - 1);
  22.         Quick_sort(A, pi + 1, end);
  23.     }
  24. }
  25.  
  26.  
  27.  
  28. int main() {
  29.     int n, i;
  30.     cout << "Enter the size of the array: ";
  31.     cin >> n;
  32.     int A[n];
  33.     cout << "Enter the elements: ";
  34.     for (i = 0; i < n; i++) {
  35.         cin >> A[i];
  36.     }
  37.     clock_t start = clock();
  38.     Quick_sort(A, 0, n - 1);
  39.     clock_t end = clock();
  40.     cout << "Sorted array: ";
  41.     for (i = 0; i < n; i++) {
  42.         cout << A[i] << " ";
  43.     }
  44.      double time_taken = double(end - start) / CLOCKS_PER_SEC * 1000;
  45.     cout <<endl<< "Time taken to sort the array: " << time_taken << " ms" << endl;
  46.     return 0;
  47. }
  48.  
Success #stdin #stdout 0.01s 5272KB
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stdin
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5
1 2 3 4 5
stdout
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Enter the size of the array: Enter the elements: Sorted array: 1 2 3 4 5 
Time taken to sort the array: 0 ms
https://ideone.com/ZP5xWK
Quick sort
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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