68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
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* C Program to Implement Quick Sort Using Randomization
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define MAX 100
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void random_shuffle(int arr[])
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{
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srand(time(NULL));
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int i, j, temp;
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for (i = MAX - 1; i > 0; i--)
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{
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j = rand()%(i + 1);
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temp = arr[i];
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arr[i] = arr[j];
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arr[j] = temp;
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}
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}
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void swap(int *a, int *b)
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{
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int temp;
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temp = *a;
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*a = *b;
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*b = temp;
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}
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int partion(int arr[], int p, int r)
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{
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int pivotIndex = p + rand()%(r - p + 1); //generates a random number as a pivot
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int pivot;
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int i = p - 1;
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int j;
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pivot = arr[pivotIndex];
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swap(&arr[pivotIndex], &arr[r]);
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for (j = p; j < r; j++)
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{
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if (arr[j] < pivot)
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{
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i++;
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swap(&arr[i], &arr[j]);
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}
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}
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swap(&arr[i+1], &arr[r]);
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return i + 1;
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}
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void quick_sort(int arr[], int p, int q)
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{
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int j;
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if (p < q)
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{
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j = partion(arr, p, q);
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quick_sort(arr, p, j-1);
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quick_sort(arr, j+1, q);
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}
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}
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int main()
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{
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int i;
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int arr[MAX];
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for (i = 0; i < MAX; i++)
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arr[i] = i;
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random_shuffle(arr); //To randomize the array
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quick_sort(arr, 0, MAX-1); //function to sort the elements of array
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for (i = 0; i < MAX; i++)
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printf("%d \n", arr[i]);
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return 0;
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} |