#include <bits/stdc++.h>
#ifndef LOCAL
#include "meetings.h"
#endif
using namespace std;
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define Time (clock() * 1.0 / CLOCKS_PER_SEC)
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1& x, T2 y) {
return y < x ? (x = y, true) : false;
}
template<typename T1, typename T2> bool chkmax(T1& x, T2 y) {
return y > x ? (x = y, true) : false;
}
void debug_out() {
cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
cerr << ' ' << A;
debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
for (int i = 0; i < n; ++i)
cerr << a[i] << ' ';
cerr << endl;
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
#define debug(...) 1337
#define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T>& v) {
for (auto& x : v)
stream << x << ' ';
return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
return stream << p.first << ' ' << p.second;
}
const int INF32 = 0x3f3f3f3f;
const int maxN = 750005;
const int K = 20;
ll cost[maxN];
int a[maxN];
namespace sgt {
const int logN = 17;
const int N = 1 << logN;
struct Node {
int mx;
int pref[K], suff[K];
// int fml[K], fmr[K];
int f[K][K];
Node() {
mx = -1;
memset(pref, 0, sizeof pref);
memset(suff, 0, sizeof suff);
// memset(fml, 0x3f, sizeof fml);
// memset(fmr, 0x3f, sizeof fmr);
memset(f, 0x3f, sizeof f);
}
Node(int x) {
mx = x;
for (int i = 0; i < K; ++i) {
pref[i] = suff[i] = max(x, i);
}
// memset(fml, 0x3f, sizeof fml);
// memset(fmr, 0x3f, sizeof fmr);
// fml[x] = fmr[x] = x;
memset(f, 0x3f, sizeof f);
f[x][x] = x;
}
void print() {
cerr << "mx = " << mx << endl;
cerr << "pref = " << pref[0] << ' ' << pref[1] << endl;
cerr << "suff = " << suff[0] << ' ' << suff[1] << endl;
for (int i = 0; i < 2; ++i) {
mdebug(f[i], 2);
}
cerr << endl;
}
} t[2 * N];
Node operator * (const Node& lhs, const Node& rhs) {
Node res;
res.mx = max(lhs.mx, rhs.mx);
for (int i = 0; i < K; ++i) {
res.pref[i] = lhs.pref[i] + rhs.pref[max(i, lhs.mx)];
res.suff[i] = rhs.suff[i] + lhs.suff[max(i, rhs.mx)];
}
// for (int i = 0; i < K; ++i) {
// if (lhs.mx == res.mx && rhs.mx <= i) {
// chkmin(res.fml[i], lhs.fml[i] + rhs.sum[i]);
// }
// chkmin(res.fml[i], rhs.fml[i] + lhs.sum[rhs.mx]);
// if (rhs.mx == res.mx && lhs.mx <= i) {
// chkmin(res.fmr[i], rhs.fmr[i] + lhs.sum[i]);
// }
// chkmin(res.fmr[i], lhs.fmr[i] + rhs.sum[lhs.mx]);
// }
for (int x = 0; x < K; ++x)
for (int y = 0; y < K; ++y) {
chkmin(res.f[x][max(y, rhs.mx)], lhs.f[x][y] + rhs.pref[y]);
chkmin(res.f[max(x, lhs.mx)][y], lhs.suff[x] + rhs.f[x][y]);
}
return res;
}
void build(int v, int vl, int vr) {
if (vl == vr) {
t[v] = Node(a[vl]);
return;
}
int vm = (vl + vr) >> 1;
build(v << 1, vl, vm);
build(v << 1 | 1, vm + 1, vr);
t[v] = t[v << 1] * t[v << 1 | 1];
}
Node gt(int v, int vl, int vr, int l, int r) {
if (l > r || vr < l || r < vl) return Node();
if (l <= vl && vr <= r) return t[v];
int vm = (vl + vr) >> 1;
return gt(v << 1, vl, vm, l, r) * gt(v << 1 | 1, vm + 1, vr, l, r);
}
}
vector<ll> minimum_costs(vector<int> _a, vector<int> ql, vector<int> qr) {
int n = _a.size(), Q = ql.size();
for (int i = 0; i < n; ++i)
a[i] = _a[i] - 1;
sgt::build(1, 0, n - 1);
vector<ll> ans(Q);
for (int j = 0; j < Q; ++j) {
int l = ql[j], r = qr[j];
auto N = sgt::gt(1, 0, n - 1, l, r);
int mn = INF32;
for (int x = 0; x < K; ++x)
for (int y = 0; y < K; ++y)
chkmin(mn, N.f[x][y]);
ans[j] = (r - l + 1) + mn;//min(*min_element(N.fml, N.fml + K), *min_element(N.fmr, N.fmr + K));
}
return ans;
}
#ifdef LOCAL
int read_int() {
int x;
if (scanf("%d", &x) != 1) {
fprintf(stderr, "Error while reading input\n");
exit(1);
}
return x;
}
int32_t main() {
#ifdef LOCAL
freopen("in", "r", stdin);
#endif
ios::sync_with_stdio(0);
cin.tie(0);
int N = read_int();
int Q = read_int();
std::vector<int> H(N);
for (int i = 0; i < N; ++i) {
H[i] = read_int();
}
std::vector<int> L(Q), R(Q);
for (int j = 0; j < Q; ++j) {
L[j] = read_int();
R[j] = read_int();
}
std::vector<long long> C = minimum_costs(H, L, R);
for (size_t j = 0; j < C.size(); ++j) {
printf("%lld\n", C[j]);
}
return 0;
return 0;
}
#endif
