What is Quick Sort in C++?

Can you explain the Quick Sort algorithm in C++?

Sure! Quick Sort 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 do I implement Quick Sort in C++?

Here's a simple implementation:

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

What is the time complexity of Quick Sort?

The average time complexity of Quick Sort is O(n log n), but in the worst case, it can be O(n²) if the pivot selection is poor.

Can you explain the partition function used in Quick Sort?

Certainly! The partition function rearranges the array elements based on the pivot. It places the pivot in its correct position and ensures that all elements less than the pivot are on the left and all greater are on the right.