#include <bits/stdc++.h>
#define endl '\n'
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define fo(i,n) for(auto i =0 ; i < n;i++)
#define fore(i,l,r) for(auto i = l; i < r;i++)
#define forex(i,r,l) for(auto i = r; i >= l; i--)
#define ffo(i,n) forex(i,n-1,0)
#define all(x) x.begin(),x.end()
#define lsb(x) x&(-x)
#define sz(x) (int)x.size()
#define gcd(a,b) __gcd(a,b)
#define vii vector<ii>
using namespace std;
using ii = pair<int,int>; using ll = long long; using ull = unsigned long long;
using vi = vector<int>;
void valid(int in){cout<<((in)?"YES\n":"NO\n");return;}
const int N=2e5+7,LOG = 20;
struct spt{
vector<vi> sp;int n;spt(){}
void make(int sz){n = sz;
sp.resize(n+1, vi(LOG,0));
for(int bit = 1;bit< LOG; bit++){
for(int i= 0; i < n-(1<<bit)+1; i++){
sp[i][bit] = max(sp[i][bit-1], sp[i+(1<<(bit-1))][bit-1]);
}
}
}
void make(vi &arr){n=sz(arr);sp.resize(n+1, vi(LOG,0));fo(i,sz(arr))sp[i][0]=arr[i];make(sz(arr));}
int query(int l, int r ){
int k = r-l+1;
int lg = log2(k);
return max(sp[l][lg], sp[(r- (1<<lg))+ 1][lg]);
}
int lwb(int idx, int val){
int l = idx, r = n-1;
while(l<=r){
int mid = (l+r)/2;
if(query(idx,mid)>sp[idx][0])r=mid-1;
else l = mid+1;
}return l;
}
int upb(int idx ,int val){
int l = 0, r = idx;
while(l<=r){
int mid = (l+r)/2;
if(query(mid, idx)>sp[idx][0])l=mid+1;
else r = mid-1;
}return r;
}
};
int n,puedo=1; vi h;
spt st;vi graph[N];
vi minDist[N];
void init(int sz, vi hj){n=sz;h=hj;
st.make(h);
fo(i,n){
// 4 pts son 4 pts
if(h[i] <= (i==0 ? -16 : h[i-1]))puedo=0;
int r = st.lwb(i, h[i]);
int l = st.upb(i, h[i]);
if(r<n)graph[i].pb(r);
if(l>-1)graph[i].pb(l);
}
}
int minimum_jumps(int A, int B, int C, int D) {
if(puedo) return C - B;
queue<int> q;vi minDist(n+1,1e9);
fore(i, A, B+1){q.push(i);minDist[i]=0;}
int ans = 1e9;
while(q.size()){
int nodo = q.front();q.pop();
for(int v : graph[nodo]){
if(minDist[v] > minDist[nodo] +1 ){
minDist[v] = minDist[nodo] +1;
q.push(v);
}
}
}fore(i,C, D+1)ans = min(ans, minDist[i]);
return (ans==1e9 ? -1 : ans);
}
