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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<time.h>
  4.  
  5. void quicksort(int*,int,int);
  6. int partition(int*,int,int);
  7. void swap(int* a,int* b)
  8. {
  9.     int temp=*a;
  10.     *a=*b;
  11.     *b=temp;
  12. }
  13.  
  14. int main()
  15. {
  16.     int n=10000;
  17.     int it=0;
  18.     srand(time(NULL));
  19.  
  20.     printf("Array_size,Time(m/s):\n");
  21.  
  22.     while(it++<10)
  23.     {
  24.         int* arr=(int*)malloc(n*sizeof(int));
  25.         if(!arr)
  26.         {
  27.             printf("Memory allocation failed\n");
  28.             return 1;
  29.         }
  30.         for(int i=0;i<n;i++)
  31.         {
  32.             arr[i]=rand()%10000;
  33.         }
  34.  
  35.         clock_t start,end;
  36.         start=clock();
  37.         quicksort(arr,0,n-1);
  38.         end=clock();
  39.  
  40.         double timetaken=((double)(end-start))*1000/CLOCKS_PER_SEC;
  41.         printf("%d,%0.5f\n",n,timetaken);
  42.  
  43.         free(arr);
  44.         n+=10000;
  45.     }
  46.     return 0;
  47. }
  48.  
  49. void quicksort(int arr[],int low,int high)
  50. {
  51.     if(low<high)
  52.     {
  53.         int j=partition(arr,low,high);
  54.         quicksort(arr,low,j-1);
  55.         quicksort(arr,j+1,high);
  56.     }
  57. }
  58.  
  59. int partition(int arr[],int low,int high)
  60. {
  61.     int pivot=arr[low];
  62.     int i=low;
  63.     int j=high+1;
  64.     while(1)
  65.     {
  66.         do{
  67.             i++;
  68.         }while(i<=high && arr[i]<pivot);
  69.         do{
  70.             j--;
  71.         }while(j>=low && arr[j]>pivot);
  72.         if(i>=j)break;
  73.         swap(&arr[i],&arr[j]);
  74.     }
  75.     swap(&arr[low],&arr[j]);
  76.     return j;
  77. }
  78.  
Success #stdin #stdout 0.06s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
Array_size,Time(m/s):
10000,1.05100
20000,2.64200
30000,2.10200
40000,3.15200
50000,4.14500
60000,5.25400
70000,5.89500
80000,7.35500
90000,7.99700
100000,8.40800
https://ideone.com/GU7hn6
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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