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quicksort_array.c
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#include <stdio.h>
void printArray(int *A, int n)
{
for (int i = 0; i < n; i++)
{
printf("%d ", A[i]);
}
printf("\n");
}
int partition(int A[], int low, int high)
{
int pivot = A[low];
int i = low + 1;
int j = high;
int temp;
do
{
while (A[i] <= pivot)
{
i++;
}
while (A[j] > pivot)
{
j--;
}
if (i < j)
{
temp = A[i];
A[i] = A[j];
A[j] = temp;
}
} while (i < j);
// Swap A[low] and A[j]
temp = A[low];
A[low] = A[j];
A[j] = temp;
return j;
}
void quickSort(int A[], int low, int high)
{
int partitionIndex; // Index of pivot after partition
if (low < high)
{
partitionIndex = partition(A, low, high);
quickSort(A, low, partitionIndex - 1); // sort left subarray
quickSort(A, partitionIndex + 1, high); // sort right subarray
}
}
int main()
{
//int A[] = {3, 5, 2, 13, 12, 3, 2, 13, 45};
int A[] = {9, 4, 4, 8, 7, 5, 6};
// 3, 5, 2, 13, 12, 3, 2, 13, 45
// 3, 2, 2, 13i, 12, 3j, 5, 13, 45
// 3, 2, 2, 3j, 12i, 13, 5, 13, 45 --> first call to partition returns 3
int n = 9;
n =7;
printArray(A, n);
quickSort(A, 0, n - 1);
printArray(A, n);
return 0;
}