#include "jumps.h"
#include <vector>
#include <algorithm>
int subtask = -1;
#define MAX_N 200000
#define MAX_M (2*MAX_N)
int N, head[MAX_N], nxt[MAX_M], vv[MAX_M], timer, ng[MAX_N], pg[MAX_N], HI[MAX_N], H[MAX_N], high[MAX_N], low[MAX_N];
int dd[MAX_N], pp[MAX_N], jj[MAX_N], dd_[MAX_N], pp_[MAX_N], jj_[MAX_N];
void link(int u, int v)
{
static int i = 1;
nxt[i] = head[u];
vv[i] = v;
head[u] = i++;
}
void init(int N, std::vector<int> H) {
::N = N;
if (N <= 200) subtask = 2;
else if (N <= 2000) subtask = 3;
int flag = 1;
for (int i = 1; i < N; ++i) if (H[i] != H[i-1] + 1) flag = 0;
if(flag) subtask = 1;
static int stk[MAX_N], so;
so = 0;
for (int i = 0; i < N; stk[so++] = i++) while (so && H[stk[so-1]] < H[i]) ng[stk[so-1]]=i, link(stk[--so], i);
while(so)ng[stk[--so]]=-1;
for (int i = N - 1; i >= 0; stk[so++] = i--) while (so && H[stk[so-1]] < H[i]) pg[stk[so-1]]=i, link(stk[--so], i);
while(so)pg[stk[--so]]=-1;
for (int i = 0; i < N; ++i) HI[::H[i]=H[i]-1] = i;
for (int j = N; j--;)
{
int i = HI[j];
int high = (pg[i] == -1) ? ng[i] : (ng[i] == -1 ? pg[i] : (H[ng[i]] > H[pg[i]] ? ng[i] : pg[i]));
if (high != -1)
{
dd[i] = dd[high] + 1;
pp[i] = high;
jj[i] = dd[high] - dd[jj[high]] == dd[jj[high]] - dd[jj[jj[high]]] ? jj[jj[high]] : high;
}
else
pp[i] = jj[i] = i;
::high[i] = high;
::low[i] = pg[i] + ng[i] - ::high[i];
int low = ::low[i];
if (low != -1)
{
dd_[i] = dd_[low] + 1;
pp_[i] = low;
jj_[i] = dd_[low] - dd_[jj_[low]] == dd_[jj_[low]] - dd_[jj_[jj_[low]]] ? jj_[jj_[low]] : low;
}
else
pp_[i] = jj_[i] = i;
}
if (subtask == -1) subtask = 4;
}
int Q_COUNTER = 0;
int minimum_jumps(int A, int B, int C, int D) {
++Q_COUNTER;
if (subtask == 1) return (A>D)?-1:(B>=C?0:C-B);
if (subtask == 4 && Q_COUNTER > 5) subtask = 5;
if(subtask <= 4)
{
int dd[MAX_N], qu[MAX_N], qh=0, qt=0,z=1e9;
for(int j=0;j<N;++j)dd[j]=1e9;
for (int i = A; i <= B; ++i) dd[qu[qh++]=i]=0;
while(qh-qt) for(int u=qu[qt++],j=head[u];j;j=nxt[j]) if(dd[vv[j]]>dd[u]+1)dd[vv[j]]=dd[u]+1,qu[qh++]=vv[j];
for (int j = C; j <= D; ++j)if(dd[j]!=1e9&&dd[j]<z)z=dd[j];
return(z<1e9?z:-1);
}
if (subtask == 5)
{
int u = A, z = 0;
for(;pp[u]!=u;)
{
if (H[jj[u]]<=H[C])u=jj[u];
else if(H[pp[u]]<=H[C])u=pp[u];
else break;
}
z=dd[A]-dd[u];
int u1=u;
for(;pp_[u]!=u;)
{
if(H[jj_[u]]<=H[C])u=jj_[u];
else if(H[pp_[u]]<=H[C])u=pp_[u];
else return -1;
}
z+=dd_[u1]-dd_[u];
return z;
}
return -1;
}
