#include <stdio.h>
// function to swap elements
void swap(int *a, int *b) {
int t = *a;
*a = *b;
*b = t;
}
// function to find the partition position
int partition(int array[], int low, int high) {
// select the rightmost element as pivot
int pivot = array[high];
// pointer for greater element
int i = (low - 1);
// traverse each element of the array
// compare them with the pivot
for (int j = low; j < high; j++) {
if (array[j] <= pivot) {
// if element smaller than pivot is found
// swap it with the greater element pointed by i
i++;
// swap element at i with element at j
swap(&array[i], &array[j]);
}
}
// swap the pivot element with the greater element at i
swap(&array[i + 1], &array[high]);
// return the partition point
return (i + 1);
}
void quickSort(int array[], int low, int high) {
if (low < high) {
// find the pivot element such that
// elements smaller than pivot are on left of pivot
// elements greater than pivot are on right of pivot
int pi = partition(array, low, high);
// recursive call on the left of pivot
quickSort(array, low, pi - 1);
// recursive call on the right of pivot
quickSort(array, pi + 1, high);
}
}
// function to print array elements
void printArray(int array[], int size) {
for (int i = 0; i < size; ++i) {
printf("%d ", array[i]);
}
printf("\n");
}
// main function
int main() {
int data[] = {8, 7, 2, 1, 0, 9, 6};
int n = sizeof(data) / sizeof(data[0]);
printf("Unsorted Array\n");
printArray(data, n);
// perform quicksort on data
quickSort(data, 0, n - 1);
printf("Sorted array in ascending order: \n");
printArray(data, n);
}
