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#include <iostream>
#include <fstream>
#define N 100002
using namespace std;
ifstream x("scmax.in");
ofstream y("scmax.out");
int n,nr,v[N],pre[N],sol[N],lg[N];
void afis(int elem)
{
if(elem)
{
afis(pre[elem]);
y<<v[elem]<<" ";
}
}
int dinamica(int elem)
{
if(nr==0 || v[sol[nr]]<elem)
{
nr++;
return nr;
}
else
{
int st=1,dr=nr;
int poz=0;
while(st<=dr)
{
int mij=(st+dr)/2;
if(v[sol[mij]]<elem)
poz=mij,st=mij+1;
else
dr=mij-1;
}
return poz+1;
}
}
int main()
{
x>>n;
int lng=0,poz,start;
for(int i=1;i<=n;i++)
{
x>>v[i];
poz=dinamica(v[i]);
sol[poz]=i;
lg[i]=lg[sol[poz-1]]+1;
pre[i]=sol[poz-1];
if(lg[i]>lng)
lng=lg[i],start=i;
}
y<<lng<<'\n';
afis(start);
x.close();
y.close();
return 0;
}