#ifndef hwe
#include "jumps.h"
#endif
#include <bits/stdc++.h>
using namespace std;
#define POPCOUNT(n) (__builtin_popcountll((n)))
#define CLZ(n) (__builtin_clzll((n)))
#define CTZ(n) (__builtin_ctzll((n)))
#define LOG(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))
#define Int __int128
#define fi first
#define se second
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;
template <class T1, class T2> bool maximize(T1 &x, T2 y) {
if (x < y) {
x = y;
return true;
}
return false;
}
template <class T1, class T2> bool minimize(T1 &x, T2 y) {
if (x > y) {
x = y;
return true;
}
return false;
}
template <class T> void remove_duplicate(vector<T> &ve) {
sort (ve.begin(), ve.end());
ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}
mt19937_64 rng(1);
template <class T1, class T2> T1 random(T1 l, T2 r) {
return uniform_int_distribution<T1>(l, r)(rng);
}
template <class T> T random(T r) {
return rng() % r;
}
const int N = 2e5 + 5, LG = 20;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const long long INF = 1e18;
int n;
int L[N][LG], R[N][LG], nxt[N][LG], pref[N];
vector<int> h;
int get(int l, int r) {
return pref[r] - (l == 0 ? 0 : pref[l - 1]);
}
void init(int _n, vector<int> H) {
n = _n, h = H;
h.insert(h.begin(), inf);
h.emplace_back(inf + 1);
n += 2;
stack<int> st;
for (int i = 0; i < n; ++i) {
while (!st.empty() && h[st.top()] < h[i]) st.pop();
L[i][0] = (st.empty() ? 0 : st.top());
st.emplace(i);
}
while (!st.empty()) st.pop();
for (int i = n - 1; i >= 0; --i) {
while (!st.empty() && h[st.top()] < h[i]) st.pop();
R[i][0] = (st.empty() ? n - 1 : st.top());
st.emplace(i);
}
for (int i = 0; i < n; ++i)
nxt[i][0] = (h[L[i][0]] > h[R[i][0]] ? L[i][0] : R[i][0]);
for (int i = 1; i < LG; ++i) for (int j = 0; j < n; ++j) {
L[j][i] = L[L[j][i - 1]][i - 1];
R[j][i] = R[R[j][i - 1]][i - 1];
nxt[j][i] = nxt[nxt[j][i - 1]][i - 1];
}
pref[0] = (h[0] < h[1]);
for (int i = 1; i + 1 < n; ++i)
pref[i] = pref[i - 1] + (h[i] < h[i + 1]);
pref[n - 1] = pref[n - 2];
}
int jump(int u, int v) {
int ans = 0;
for (int i = LG - 1; i >= 0; --i) {
if (h[nxt[u][i]] <= h[v]) {
u = nxt[u][i];
ans += MASK(i);
}
}
for (int i = LG - 1; i >= 0; --i) {
if (h[L[u][i]] <= h[v]) {
u = L[u][i];
ans += MASK(i);
}
if (h[R[u][i]] <= h[v]) {
u = R[u][i];
ans += MASK(i);
}
}
if (u == v) return ans;
return inf;
}
int getMax(int l, int r) {
int u = l;
for (int i = LG - 1; i >= 0; --i) {
if (R[u][i] <= r) u = R[u][i];
}
return u;
}
int minimum_jumps(int a, int b, int c, int d) {
++a, ++b, ++c, ++d;
if (max(a, c) <= min(b, d)) return 0;
if (b + 1 == c)
int opt = b;
for (int i = LG - 1; i >= 0; --i) {
if (L[opt][i] >= a && h[L[opt][i]] <= h[c]) opt = L[opt][i];
}
int ans = jump(opt, c);
return (ans == inf ? -1 : ans);
}
#ifdef hwe
signed main() {
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
int n, q; cin >> n >> q;
vector<int> h(n);
for (auto &x : h) cin >> x;
init(n, h);
for (int _ = 0; _ < 4; ++_) {
int a = random(n), b = random(n);
if (a > b) swap(a, b);
int c, d; c = d = random(n);
// int a, b, c, d; cin >> a >> b >> c >> d;
cerr << a << ' ' << b << ' ' << c << ' ' << d << '\n';
int real_ans = inf;
for (int i = a; i <= b; ++i) minimize(real_ans, jump(i + 1, c + 1));
cerr << minimum_jumps(a, b, c, d) << ' ' << (real_ans == inf ? -1 : real_ans) << '\n';
}
return 0;
}
#endif
