From abbe8e65cb8d6cf150e24adf9e99e4b3e2509c13 Mon Sep 17 00:00:00 2001
From: Pooja-Das <81691805+Pooja-Das@users.noreply.github.com>
Date: Thu, 7 Oct 2021 21:45:14 +0530
Subject: [PATCH] Implemented the Merge Sorting using devide and Conquer in C++

---
 Merge Sorting using Devide and Conquer | 87 ++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Merge Sorting using Devide and Conquer

diff --git a/Merge Sorting using Devide and Conquer b/Merge Sorting using Devide and Conquer
new file mode 100644
index 0000000..8f487d3
--- /dev/null
+++ b/Merge Sorting using Devide and Conquer	
@@ -0,0 +1,87 @@
+#include<bits/stdc++.h>
+using namespace std;
+int Merge(int A[],int p, int q,int r)     
+{
+
+    int n1,n2,i,j,k; 
+    //size of left array=n1
+    //size of right array=n2       
+    n1=q-p+1;
+    n2=r-q;             
+    int L[n1],R[n2];
+    //initializing the value of Left part to L[]
+    for(i=0;i<n1;i++)
+    {
+        L[i]=A[p+i];
+    }
+    //initializing the value of Right Part to R[]
+    for(j=0;j<n2;j++)
+    {
+        R[j]=A[q+j+1];
+    }
+    i=0,j=0;
+    //Comparing and merging them
+    //into new array in sorted order 
+    for(k=p;i<n1&&j<n2;k++)
+    {
+        if(L[i]<R[j])
+        {
+            A[k]=L[i++];
+        }
+        else
+        {
+            A[k]=R[j++];
+        }
+    }
+    //If Left Array L[] has more elements than Right Array R[]
+    //then it will put all the
+    // reamining elements of L[] into A[]
+    while(i<n1)             
+    {
+        A[k++]=L[i++];
+    }
+    //If Right Array R[] has more elements than Left Array L[]
+    //then it will put all the
+    // reamining elements of L[] into A[]
+    while(j<n2)
+    {
+        A[k++]=R[j++];
+    }
+}
+//This is Divide Part
+//This part will Divide the array into 
+//Sub array and then will Merge them
+//by calling Merge()
+int MergeSort(int A[],int p,int r)    
+{
+    int q;                                
+    if(p<r)
+    {
+        q=(p+r)/2;
+        MergeSort(A,p,q);
+        MergeSort(A,q+1,r);
+        Merge(A,p,q,r);
+    }
+}
+int main()
+{
+    int n;
+    cout<<"Enter size of the Array: ";
+    cin>>n;
+    int A[n],i;
+    cout<<"Enter array values:\n";
+    for(i=0;i<n;i++)
+    cin>>A[i];
+    //Calling the MergeSort()
+    //First we are passing the array
+    //the start index that is 0
+    //and the size of the array n
+    
+    MergeSort(A,0,n-1);
+    cout<<"The Sorted List is\n";
+    for(i=0;i<n;i++)
+    {
+        cout<<A[i]<<" ";
+    }
+    return 0;
+}