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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("algsort.in");
ofstream fout("algsort.out");
int v[100],i,j,k,t,p,n;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
fin>>v[i]; i=1; j=n;
for(k=1;k<=n-2;k=k+2,i++,j--)
{
for(t=i;t<j;t++)
if(v[t]>v[t+1])
{
p=v[t+1];
v[t+1]=v[t];
v[t]=p;
}
for(t=j-1;t>i;t=t-1)
if(v[t]<v[t-1])
{
p=v[t-1];
v[t-1]=v[t];
v[t]=p;
}
}
for(i=1;i<=n;i++)
fout<<v[i]<<' ';
fin.close();
fout.close();
return 0;
}