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#include <bits/stdc++.h>
using namespace std;
vector<int> LIS;
int cautare_binara(int val, int dr)
{
int poz=0, st=0;
while(st<=dr)
{
int mij=st+(dr-st)/2;
if(val<=LIS[mij])
{
poz=mij;
dr=mij-1;
}
else
st=mij+1;
}
return poz;
}
int main()
{
ifstream cin("scmax.in");
ofstream cout("scmax.out");
int n;
cin >> n;
LIS.reserve(n);
for(int i=0; i<n; i++)
{
int a;
cin >> a;
if(LIS.empty())
LIS.push_back(a);
else
{
if(a>LIS.back())
LIS.push_back(a);
int pozitie=cautare_binara(a, i);
LIS[pozitie]=a;
}
}
cout << LIS.size() << "\n";
for(auto& element : LIS) cout << element << " ";
return 0;
}