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Cod sursa(job #785029)
#include<fstream>
#include<algorithm>
using namespace std;
int v[500001];
void read(int &n)
{
int i;
ifstream fin("algsort.in");
fin>>n;
for(i=1;i<=n;++i)
fin>>v[i];
fin.close();
}
void inter(int ft,int mid,int bk)
{
int i,j,k=0,a[500001];
for(i=ft,j=mid+1;i<=mid && j<=bk;)
{
a[++k]=min(v[i],v[j]);
if(v[i]<v[j])
++i;
else
++j;
}
for(;i<=mid;++i)
a[++k]=v[i];
for(;j<=bk;++j)
a[++k]=v[j];
for(i=ft,j=1;j<=k;++i,++j)
v[i]=a[j];
}
void merge(int ft,int bk)
{
if(ft==bk)
return;
int mid=(ft+bk)>>1;
merge(ft,mid);
merge(mid+1,bk);
inter(ft,mid,bk);
}
void out(int n)
{
ofstream fout("algsort.out");
for(int i=1;i<=n;i++)
fout<<v[i]<<" ";
fout.close();
}
int main()
{
int ft,mid,bk,n;
read(n);
merge(1,n);
out(n);
}