What is the quicksort algorithm in C++?

Can you explain the quicksort algorithm in C++?

Sure! Quicksort is a divide-and-conquer algorithm that sorts an array by selecting a 'pivot' element and partitioning the other elements into two sub-arrays according to whether they are less than or greater than the pivot.

How does the partitioning process work?

During partitioning, elements are rearranged so that all elements less than the pivot come before it and all elements greater come after it. This is done using two pointers that traverse the array.

Can you show me a simple implementation of quicksort in C++?

Certainly! Here's a basic implementation:

void quicksort(int arr[], int low, int high) {
    if (low < high) {
        int pivot = partition(arr, low, high);
        quicksort(arr, low, pivot - 1);
        quicksort(arr, pivot + 1, high);
    }
}

What is the time complexity of quicksort?

The average time complexity of quicksort is O(n log n), but in the worst case, it can degrade to O(n²) if the pivot is poorly chosen.