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mergesort.cpp
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64 lines (61 loc) · 885 Bytes
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#include<iostream>
using namespace std;
void merge(int *a,int s, int e)
{
int m=(s+e)/2;
int temp[100]={0};
int i=s;
int j=m+1;
int k=s;
while(i<=m&&j<=e)
{
if(a[i]<a[j])
{
temp[k++]=a[i++];
}
else
{
temp[k++]=a[j++];
}
}
while(j<=e)
{
temp[k++]=a[j++];
}
while(i<=m)
{
temp[k++]=a[i++];
}
for(int i=s;i<=e;i++)
{
a[i]=temp[i];
}
}
void mergesort(int *a,int s,int e)
{
if(s>=e)
{
return;
}
int m=(s+e)/2;
mergesort(a,s,m);
mergesort(a,m+1,e);
merge(a,s,e);
}
int main()
{
int n;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
{
cin>>a[i];
}
int s=0;
int e=n-1;
mergesort(a,s,e);
for(int i=0;i<n;i++)
{
cout<<a[i]<<" ";
}
}