What is the mergesort algorithm in C++?

Can you explain how the mergesort algorithm works in C++?

Sure! Mergesort is a divide-and-conquer algorithm that sorts an array by dividing it into two halves, sorting each half, and then merging them back together.

How do I implement mergesort in C++?

Here's a simple implementation:

void merge(int arr[], int left, int mid, int right) {
    // Merging logic here
}

void mergesort(int arr[], int left, int right) {
    if (left < right) {
        int mid = left + (right - left) / 2;
        mergesort(arr, left, mid);
        mergesort(arr, mid + 1, right);
        merge(arr, left, mid, right);
    }
}

What is the time complexity of mergesort?

The time complexity of mergesort is O(n log n) in the average and worst cases, making it efficient for large datasets.

Are there any advantages of using mergesort over other sorting algorithms?

Yes, mergesort is stable and works well with large datasets, especially when the data is too large to fit into memory.