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mergesort.c
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mergesort.c
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#include<stdio.h>
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[25],R[25];
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=1;
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++;
}
}
void mergeSort(int arr[],int l,int r)
{
if(l<r)
{
int m=(l+r)/2;
mergesort(arr,l,m);
mergesort(arr,m+1,r);
merge(arr,l,m,r);
}
}
void printArray(int arr[],int n)
{
int i;
for(i=0;i<n;i++)
{
printf("%d",arr[i]);
}
printf("\n");
}
int main()
{
int arr[]={ 67,65,34,45,98,78,18};
mergeSort(arr,0,7);
printArray(arr,8);
return 0;
}