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  1. #include<stdio.h>
  2.  
  3. void swap(int *a, int *b){
  4.         int temp = *a;
  5.         *a=*b;
  6.         *b=temp;
  7. }
  8.  
  9. int partition(int arr[], int l, int r){
  10.         int pivot = arr[l];
  11.         int left,right;
  12.         for(left=l+1,right=r;left<=right;){
  13.             if(arr[left]>pivot && arr[right]<=pivot){
  14.                     swap(&arr[left],&arr[right]);
  15.             }
  16.             if(arr[left]<=pivot) {
  17.                     left++;
  18.             }
  19.             if(arr[right]>pivot) {
  20.                     right--;
  21.             }
  22.     }
  23.             swap(&arr[l],&arr[right]);
  24. //            printf("%d\n",right);
  25.             return right;
  26. }
  27.  
  28.     void quicksort(int arr[], int l, int r){
  29.             int p;
  30.         if (l < r){
  31.                 p = partition(arr,l,r);
  32.                 quicksort(arr,l,p-1);
  33.                 quicksort(arr,p+1,r);
  34.         }
  35. }
  36.  
  37.    int main(){
  38.             int i,size;
  39.          // int arr[] = { 10, 20, 7 , 5, 24 , 17, 13, 56, 38, 12 , 29, 46};
  40.             int arr[] = {0,2,2};
  41.         //  int arr[] = {2,2,1,0};
  42.             size = sizeof(arr)/sizeof(arr[0]);
  43.             printf("The array before sorting is --->");
  44.             for(i=0;i<size;i++){
  45.                     printf("--->%d",arr[i]);
  46.             }
  47.             printf("--->END\n\n");
  48.             quicksort(arr,0,size-1);
  49.             printf("The array after sorting is --->");
  50.             for(i=0;i<size;i++){
  51.                     printf("--->%d",arr[i]);
  52.             }
  53.             printf("--->END");
  54.  
  55.             return 0;
  56.     }
Success #stdin #stdout 0s 2292KB
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The array before sorting is --->--->0--->2--->2--->END

The array after sorting is --->--->0--->2--->2--->END
https://ideone.com/oWbONR
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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