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  1. #include <stdio.h>
  2.  
  3.  
  4.  
  5. void swap(int *a, int *b) {
  6.     int temp = *a;
  7.     *a = *b;
  8.     *b = temp;
  9. }
  10.  
  11. void quick_sort(int *a, int imin, int imax) {
  12.     if (imax <= imin) return ;
  13.     int imid = (imin + imax)/2;
  14.     int pivot = a[imid];
  15.     swap(&a[imid], &a[imax-1]);
  16.     int i, j = imin;
  17.     for (i = imin; i < imax-1; i += 1) {
  18.         if (a[i] < pivot) {
  19.             swap(&a[i], &a[j]);
  20.             j += 1;
  21.         }
  22.     }
  23.     swap(&a[j], &a[imax-1]);
  24.     quick_sort(a, imin, j);
  25.     quick_sort(a, j+1, imax);
  26. }
  27.  
  28. int main() {
  29.     int i;
  30.     int a[6] = {6, 9, 5, 2, 8, 1};
  31.     for (i = 0; i < 6; i += 1)
  32.         printf("%d ", a[i]);
  33.     printf("\n");
  34.     quick_sort(a, 0, 6);
  35.     for (i = 0; i < 6; i += 1)
  36.         printf("%d ", a[i]);
  37.     return 0;
  38. }
  39.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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6 9 5 1 8 
1 5 6 8 9
https://ideone.com/GpjJER
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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