1using System;
2
3class MergeSort {
4    void Merge(int[] arr, int left, int mid, int right) {
5        int n1 = mid - left + 1;
6        int n2 = right - mid;
7        int[] L = new int[n1];
8        int[] R = new int[n2];
9
10        for (int i = 0; i < n1; ++i)
11            L[i] = arr[left + i];
12        for (int j = 0; j < n2; ++j)
13            R[j] = arr[mid + 1 + j];
14
15        int iIndex = 0, jIndex = 0;
16        int k = left;
17        while (iIndex < n1 && jIndex < n2) {
18            if (L[iIndex] <= R[jIndex]) {
19                arr[k] = L[iIndex];
20                iIndex++;
21            } else {
22                arr[k] = R[jIndex];
23                jIndex++;
24            }
25            k++;
26        }
27
28        while (iIndex < n1) {
29            arr[k] = L[iIndex];
30            iIndex++;
31            k++;
32        }
33
34        while (jIndex < n2) {
35            arr[k] = R[jIndex];
36            jIndex++;
37            k++;
38        }
39    }
40
41    void MergeSortFunction(int[] arr, int left, int right) {
42        if (left < right) {
43            int mid = left + (right - left) / 2;
44
45            MergeSortFunction(arr, left, mid);
46            MergeSortFunction(arr, mid + 1, right);
47
48            Merge(arr, left, mid, right);
49        }
50    }
51
52    public static void Main(String[] args) {
53        int[] arr = {12, 11, 13, 5, 6, 7};
54        MergeSort ob = new MergeSort();
55        ob.MergeSortFunction(arr, 0, arr.Length - 1);
56        Console.WriteLine("Sorted array:");
57        Console.WriteLine(string.Join(" ", arr));
58    }
59}

1#include