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#include <fstream>
#define NMAX 100002
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int a[NMAX], n, poz[NMAX], best[NMAX], lgmax, s[NMAX];
void citire();
void constrbest();
void afisare();
int cautbin(int x);
int main()
{
citire();
constrbest();
afisare();
return 0;
}
void citire()
{
int i;
fin>>n;
for(i=1;i<=n;++i)
fin>>a[i];
}
void constrbest()
{
int i, pozitie;
best[1]=a[1]; lgmax=1; poz[1]=1;
for(i=2;i<=n;++i)
if(a[i]>best[lgmax])
{
best[++lgmax]=a[i];
poz[i]=lgmax;
}
else
{
pozitie=cautbin(a[i]);
best[pozitie]=a[i];
poz[i]=pozitie;
}
}
void afisare()
{
int i, cine;
fout<<lgmax<<'\n';
cine=lgmax;
for(i=n;i>=1 && cine;--i)
{
if(poz[i]==cine)
s[cine]=a[i], cine--;
}
for(i=1;i<=lgmax;++i)
fout<<s[i]<<' ';
fout<<'\n';
}
int cautbin(int x)
{
int st=0, dr=lgmax+1, mij;
while(dr-st>1)
{
mij=(st+dr)/2;
if(best[mij]>=x)
dr=mij;
else st=mij;
}
return dr;
}