#include using namespace std; typedef long long int ll; typedef unsigned long long ull; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); ll myRand(ll B) { return (ull)rng() % B; } int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); int n; cin >> n; vector> v(n); for(int i=0;i> v[i].first; v[i].second=i; } vector used(n+1); int res=0; sort(v.begin(), v.end()); for(int i=0;i