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iterative_merge_sort.cpp
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iterative_merge_sort.cpp
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#include<stdlib.h>
#include<stdio.h>
#include<iostream>
using namespace std;
void merge(int arr[], int l, int m, int r);
int min(int x, int y) { return (x<y)? x :y; }
void mergeSort(int arr[], int n)
{
int curr_size;
int left_start;
for (curr_size=1; curr_size<=n-1; curr_size = 2*curr_size)
{
for (left_start=0; left_start<n-1; left_start += 2*curr_size)
{
int mid = left_start + curr_size - 1;
int right_end = min(left_start + 2*curr_size - 1, n-1);
merge(arr, left_start, mid, right_end);
}
}
}
void merge(int arr[], int l, int m, int r)
{
int i, j, k;
int n1 = m - l + 1;
int n2 = r - m;
int L[n1], R[n2];
for (i = 0; i < n1; i++)
L[i] = arr[l + i];
for (j = 0; j < n2; j++)
R[j] = arr[m + 1+ j];
i = 0;
j = 0;
k = l;
while (i < n1 && j < n2)
{
if (L[i] <= R[j])
{
arr[k] = L[i];
i++;
}
else
{
arr[k] = R[j];
j++;
}
k++;
}
while (i < n1)
{
arr[k] = L[i];
i++;
k++;
}
while (j < n2)
{
arr[k] = R[j];
j++;
k++;
}
}
void printArray(int A[], int size)
{
int i;
for (i=0; i < size; i++)
printf("%d ", A[i]);
printf("\n");
}
int main()
{
int arr[] = {12, 11, 13, 5, 6, 7};
int n = sizeof(arr)/sizeof(arr[0]);
printf("Given array is \n");
printArray(arr, n);
mergeSort(arr, n);
printf("\nSorted array is \n");
printArray(arr, n);
return 0;
}