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Cod sursa(job #671463)
#include <fstream>
#include <cstdlib>
using namespace std;
const int N=500005;
int v[N],aux[N],n;
ifstream in("algsort.in");
ofstream out("algsort.out");
void merge(int st,int dr)
{
if (st==dr)
return;
int m=st+dr>>1;
merge(st,m);merge(m+1,dr);
for (int i=st,j=m+1,k=st;k<=dr;k++)
if (j>dr || i<=m && v[i]<v[j])
aux[k]=v[i++];
else
aux[k]=v[j++];
for (int i=st;i<=dr;i++)
v[i]=aux[i];
}
inline void sch(int &a,int &b)
{
int c=a;a=b;b=c;
}
void quick(int st,int dr)
{
if (st>=dr)
return;
int p=v[st+rand()*rand()%(dr-st+1)],i,j;
for (i=st,j=dr;i<j;)
{
for (;i<j && v[i]<p;i++);
for (;i<j && v[j]>p;j--);
if (i<j)
sch(v[i++],v[j++]);
}
quick(st,i-1);quick(i+1,dr);
}
int main()
{
in>>n;
for (int i=1;i<=n;i++)
in>>v[i];
quick(1,n);
for (int i=1;i<=n;i++)
out<<v[i]<<" ";
out<<"\n";
return 0;
}