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sort_orig.c
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sort_orig.c
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/*
https://www.geeksforgeeks.org/quick-sort/
*/
// C code to implement quicksort
#include <stdio.h>
// Function to swap two elements
void swap(int* a, int* b)
{
int t = *a;
*a = *b;
*b = t;
}
// Partition the array using the last element as the pivot
int partition(int arr[], int low, int high)
{
// Choosing the pivot
int pivot = arr[high];
// Index of smaller element and indicates
// the right position of pivot found so far
int i = (low - 1);
for (int j = low; j <= high - 1; j++) {
// If current element is smaller than the pivot
if (arr[j] < pivot) {
// Increment index of smaller element
i++;
swap(&arr[i], &arr[j]);
}
}
swap(&arr[i + 1], &arr[high]);
return (i + 1);
}
// The main function that implements QuickSort
// arr[] --> Array to be sorted,
// low --> Starting index,
// high --> Ending index
void quickSort(int arr[], int low, int high)
{
if (low < high) {
// pi is partitioning index, arr[p]
// is now at right place
int pi = partition(arr, low, high);
// Separately sort elements before
// partition and after partition
quickSort(arr, low, pi - 1);
quickSort(arr, pi + 1, high);
}
}
// Driver code
int main()
{
int arr[] = { 10, 7, 8, 9, 1, 5 };
int N = sizeof(arr) / sizeof(arr[0]);
// Function call
quickSort(arr, 0, N - 1);
printf("Sorted array: \n");
for (int i = 0; i < N; i++)
printf("%d ", arr[i]);
return 0;
}