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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <time.h>
  4.  
  5. int count = 0;
  6.  
  7. void merge(int a[], int low, int mid, int high) {
  8.     int i = low, j = mid + 1, k = 0;
  9.     int c[10000];
  10.  
  11.     while (i <= mid && j <= high) {
  12.         count++;  // Count each comparison
  13.         if (a[i] < a[j])
  14.             c[k++] = a[i++];
  15.         else
  16.             c[k++] = a[j++];
  17.     }
  18.  
  19.     while (i <= mid)
  20.         c[k++] = a[i++];
  21.     while (j <= high)
  22.         c[k++] = a[j++];
  23.  
  24.     for (i = low, j = 0; j < k; i++, j++)
  25.         a[i] = c[j];
  26. }
  27.  
  28. void merge_sort(int a[], int low, int high) {
  29.     if (low < high) {
  30.         int mid = (low + high) / 2;
  31.         merge_sort(a, low, mid);
  32.         merge_sort(a, mid + 1, high);
  33.         merge(a, low, mid, high);
  34.     }
  35. }
  36.  
  37. int main() {
  38.     int a[10000], n, i;
  39.  
  40.     printf("Enter the number of elements in the array: ");
  41.     scanf("%d", &n);
  42.  
  43.     printf("All the elements:\n");
  44.     srand(time(0));
  45.     for (i = 0; i < n; i++) {
  46.         a[i] = rand();
  47.         printf("%d ", a[i]);
  48.     }
  49.  
  50.     merge_sort(a, 0, n - 1);
  51.  
  52.     printf("\n\nAfter sorting:\n");
  53.     for (i = 0; i < n; i++)
  54.         printf("%d ", a[i]);
  55.  
  56.     printf("\n\nNumber of basic operations = %d\n", count);
  57.  
  58.     return 0;
  59. }
  60.  
Success #stdin #stdout 0s 5320KB
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stdin
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Standard input is empty
stdout
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Enter the number of elements in the array: All the elements:


After sorting:


Number of basic operations = 0
https://ideone.com/k52m18
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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