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  1. #include <stdio.h>
  2. #include <omp.h>
  3.  
  4. void merge(int arr[], int l, int m, int r) {
  5.     int i = l, j = m+1, k = 0;
  6.     int temp[100000];
  7.  
  8.     while(i <= m && j <= r) {
  9.         if(arr[i] < arr[j]) temp[k++] = arr[i++];
  10.         else temp[k++] = arr[j++];
  11.     }
  12.  
  13.     while(i <= m) temp[k++] = arr[i++];
  14.     while(j <= r) temp[k++] = arr[j++];
  15.  
  16.     for(i = l, k = 0; i <= r; i++, k++)
  17.         arr[i] = temp[k];
  18. }
  19.  
  20. void mergeSort(int arr[], int l, int r) {
  21.     if(l < r) {
  22.         int m = (l + r) / 2;
  23.  
  24.         #pragma omp task
  25.         mergeSort(arr, l, m);
  26.  
  27.         #pragma omp task
  28.         mergeSort(arr, m+1, r);
  29.  
  30.         #pragma omp taskwait
  31.         merge(arr, l, m, r);
  32.     }
  33. }
  34.  
  35. int main() {
  36.     int arr[10000];
  37.  
  38.     // fill array
  39.     for(int i = 0; i < 10000; i++)
  40.         arr[i] = rand() % 1000;
  41.  
  42.     #pragma omp parallel
  43.     {
  44.         #pragma omp single
  45.         mergeSort(arr, 0, 9999);
  46.     }
  47.  
  48.     return 0;
  49. }
Success #stdin #stdout 0s 5292KB
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https://ideone.com/ChjVk5
language:
C (gcc 8.3)
created:
3 hours ago
visibility:
public

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