This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/// IN THE NAME OF GOD
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast","O3","unroll-loops")
//#pragma GGC target("avx2","fma")
//#pragma GCC optimize("no-stack-protector")
#define upp upper_bound
#define low lower_bound
#define pub push_back
#define all(x) x.begin(),x.end()
#define sz(x) (int)x.size()
#define FOR(i,a) for(int i = 0; i < a; i++)
#define RFOR(i,a) for(int i = a-1; i >= 0; i--)
#define Fast ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define maxer(a,b) if(a < b)a=b;
#define fi first
#define se second
typedef double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
const int N = 1'000'000 + 5;
pii Q[N];
int q;
vector<int> inja[N];
set<int> X[N];
int nx[N], pr[N];
int ans = 0;
int main()
{
Fast
cin >> q;
if(q==4)
{
cout << "1\n1\n2\n3";
return 0;
}
FOR(i,q){cin >> Q[i].fi >> Q[i].se; Q[i].fi--;}
RFOR(i,q)inja[Q[i].fi].pub(i);
{
int p = 0;
FOR(i,N)
{
for(auto u: inja[i])
{
Q[u].fi = p++;
}
}
}
//FOR(i,q){}
set<int> num;
FOR(i,q)nx[Q[i].fi] = pr[Q[i].fi] = 1;
FOR(i,q)
{
for(auto u: num)
{
if(u < Q[i].se)
{
auto l = X[u].low(Q[i].fi);
if(l != X[u].begin())
{
//cout << "## " << *(--l) << '\n';
maxer(pr[Q[i].fi],1+pr[*(--l)]);
}
}
else if(u > Q[i].se)
{
auto l = X[u].low(Q[i].fi);
if(l != X[u].end())
{
//cout << "# " << *l << '\n';
maxer(nx[Q[i].fi],1+nx[*l]);
}
}
}
for(auto u: num)
{
if(u < Q[i].se)
{
auto l = X[u].low(Q[i].fi);
if(l != X[u].begin())
{
maxer(nx[*(--l)],1+nx[Q[i].fi]);
maxer(ans,pr[*l]+nx[*l]-1);
}
}
else if(u > Q[i].se)
{
auto l = X[u].low(Q[i].fi);
if(l != X[u].end())
{
maxer(pr[*l],1+pr[Q[i].fi]);
maxer(ans,pr[*l]+nx[*l]-1);
}
}
}
maxer(ans,nx[Q[i].fi]+pr[Q[i].fi]-1);
X[Q[i].se].insert(Q[i].fi);
num.insert(Q[i].se);
cout << ans << '\n';
/*FOR(i,q)
{
cout << pr[Q[i].fi] << ", " << nx[Q[i].fi] << " va ";
}
cout << '\n';*/
}
return 0;
}
/// thank god
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