merge sort

 void merge(int arr1[], int n1,  int arr2[],

                             int n2, int arr3[]) 

    int i = 0, j = 0, k = 0; 

  

    // Traverse both array 

    while (i<n1 && j <n2) 

    { 

        // Check if current element of first 

        // array is smaller than current element 

        // of second array. If yes, store first 

        // array element and increment first array 

        // index. Otherwise do same with second array 

        if (arr1[i] < arr2[j]) 

            arr3[k++] = arr1[i++]; 

        else

            arr3[k++] = arr2[j++]; 

    } 

  

    // Store remaining elements of first array 

    while (i < n1) 

        arr3[k++] = arr1[i++]; 

  

    // Store remaining elements of second array 

    while (j < n2) 

        arr3[k++] = arr2[j++]; 


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