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mergeSort.c
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mergeSort.c
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#include<stdio.h>
#define max 100
void MergeSort(int *,int,int);
void Merge(int *,int,int,int);
int main()
{
int a[max],i,n;
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
MergeSort(a,0,(n-1));
for(i=0;i<n;i++)
{
printf("%d ",a[i]);
}
return 0;
}
void MergeSort(int *arr,int low, int high)
{
int mid;
mid =(low+high)/2;
if(low<high)
{
MergeSort(arr,low,mid);
MergeSort(arr,(mid+1),high);
Merge(arr,low,mid,high);
}
return;
}
void Merge(int *arr,int low, int mid, int high )
{
int tempArr[high-low+1];
int p=0,lpos=low,rpos=mid+1,i;
while((lpos<=mid)&&(rpos<=high))
{
if(arr[lpos]<arr[rpos])
{
tempArr[p++]=arr[lpos++];
}
else
{
tempArr[p++]=arr[rpos++];
}
}
while(lpos<=mid)
{
tempArr[p++]=arr[lpos++];
}
while(rpos<=high)
{
tempArr[p++]=arr[rpos++];
}
for(i=0;i<p;i++)/*here I am copying back the sorted array to original array*/
{
arr[i+low]=tempArr[i];
}
return;
}