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  1. #include<stdio.h>
  2.  
  3. void swap(int *i, int *j)
  4. {
  5.     int temp = *i;
  6.     *i = *j;
  7.     *j = temp;
  8. }
  9.  
  10. int partition(int arr[], int start, int end)
  11. {
  12.     int pivot = arr[end];
  13.     int i = start;
  14.     int j = end-1;
  15.     while(i<=j)
  16.     {
  17.         while(arr[i]<pivot)
  18.             i++;
  19.  		while(arr[j]>pivot)
  20.             j--;
  21.  		if(i<=j)
  22.         {
  23.             swap(&arr[i],&arr[j]);
  24.             i++;
  25.             j--;
  26.         }
  27.     }
  28.  
  29.     swap(&arr[i],&arr[end]);
  30.     return i;
  31. }
  32.  
  33. void performQuickSort(int arr[], int start, int end)
  34. {
  35.     if(start<end)
  36.     {
  37.         int p = partition(arr, start, end);
  38.         performQuickSort(arr, start, p-1);
  39.         performQuickSort(arr, p+1, end);
  40.     }
  41. }
  42.  
  43. void quickSort(int arr[], int size)
  44. {
  45.     performQuickSort(arr, 0, size-1);
  46. }
  47.  
  48. // driver program
  49. int main(void)
  50. {
  51.     int i;
  52.     int arr[10] = {2, 6, 4, 10, 8, 1, 9, 5, 3, 7};
  53.  
  54.     quickSort(arr,10);
  55.  
  56.     printf("The 5th largest number in array is:-  %d", arr[10 - 5]);
  57.     return 0;
  58. }
  59.  
Success #stdin #stdout 0s 2168KB
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Standard input is empty
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The 5th largest number in array is:-  6
https://ideone.com/AXvFAq
language:
C (gcc 8.3)
created:
7 years ago
visibility:
secret

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