#include <bits/stdc++.h> //Andrei Alexandru a.k.a Sho
#include "popa.h"
using ll=long long;
using ld=long double;
int const INF=1000000005;
ll const LINF=1000000000000000005;
ll const mod=1000000007;
ld const PI=3.14159265359;
ll const MAX_N=3e5+5;
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define endl '\n'
#define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
int solve(int n,int *left,int *right){
ll root=-1;
vector<ll>st;
for(ll i=0;i<n;i++)
{
left[i]=right[i]=-1;
while(st.size()&&query(st.back(),i,i,i)){
right[st.back()]=left[i];
left[i]=st.back();
st.pop_back();
}
if(st.size()){
right[st.back()]=i;
}else root=i;
st.pb(i);
}
return root;
}
/*
int32_t main(){
CODE_START;
#ifdef LOCAL
freopen("input.txt", "r", stdin);
#endif
*/
