#include "railroad.h"
#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(ll i=a,ioi=b;i<ioi;i++)
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define imp(v) {for(auto dkfjhg:v)cout<<dkfjhg<<" ";cout<<"\n";}
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
const ll MAXN=2e5+5,INF=1e15;
long long plan_roller_coaster(std::vector<int> A, std::vector<int> B) {
vector<ll>a,b;
for(auto i:A)a.pb(i);
for(auto i:B)b.pb(i);
a.pb(INF); b.pb(1);
ll n=SZ(a);
vector<ii>ev;
fore(i,0,n){
ev.pb({a[i],1});
ev.pb({b[i],-1});
}
sort(ALL(ev));
ll s=0,flag=1;
fore(i,0,SZ(ev)){
s+=ev[i].snd;
if(i==SZ(ev)-1||ev[i].fst!=ev[i+1].fst)flag&=s<=0;
}
return !flag;
}
