SCLM upper_bound

#include <bits/stdc++.h>

using namespace std;

int main () {
    ifstream fin ("sclm2.in");
    ofstream fout ("sclm2.out");
    vector < int > deck;
    int n, x;
    for(fin >> n; n; n--) {
        fin >> x;
        auto it = upper_bound(deck.begin(), deck.end(), x);
        if(it == deck.end())
            deck.emplace_back(x);
        else
            *it = x;
    }
    fout << deck.size();
}