This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll i,n,x,a[200005];
set<ll> s;
set<ll> ::iterator it;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n >> x;
	for(i=1;i<=n;i++) cin >> a[i];
	for(i=1;i<=n;i++){
		it=s.upper_bound(a[i]);
		if(it!=s.end()) s.erase(it);
		s.insert(a[i]);
	}
	cout << s.size();
}
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