#include <bits/stdc++.h>
using namespace std;

using ll = long long;

// [a -> b-1]
#define reps(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
// [0 -> a-1]
#define rep(i, a) reps(i, 0, (a))
// [a-1 -> b]
#define rreps(i, a, b) for (int i = (int)((a)-1); i >= (int)(b); i--)
// [a-1 -> 0]
#define rrep(i, a) rreps(i, a, 0)
#define all(v) (v).begin(), (v).end()
// next_permutation(all(v))
#define PERM(v) next_permutation(all(v))
/*sort(all(v));
 * (v).erase(unique(all(v)), v.end())*/
#define UNIQUE(v)\
	sort(all(v));\
	(v).erase(unique(all(v)), v.end())
// b is [a, c)
#define RANGE(a, b, c) ((a) <= (b) && (b) < (c))
// c is [a, e) && d is [b, f)
#define RANGE2D(a, b, c, d, e, f) (RANGE((a), (c), (e)) && RANGE((b), (d), (f)))
#define chmin(a, b) a = min(a, (b))
#define chmax(a, b) a = max(a, (b))
#define fcout cout << fixed << setprecision(15)
#define YES(f) cout << ((f) ? YES_STR : NO_STR) << endl;

#ifdef LOCAL_DEBUG_OPTION
namespace debug_print_n{
struct DebugPrint {
	template<class T, class U = remove_const_t<remove_reference_t<T>>>
	static enable_if_t<is_integral<U>::value && !is_same<U, bool>::value && !is_same<U, char>::value> DUMP_SUB_FUNCTION(T x) {
		cerr << x;
	}
	template<class T, class U = remove_const_t<remove_reference_t<T>>>
	static enable_if_t<is_same<U, bool>::value> DUMP_SUB_FUNCTION(T x) {
		if (x) cerr << "True";
		else cerr << "False";
	}
	template<class T, class U = remove_const_t<remove_reference_t<T>>>
	static enable_if_t<is_same<U, char>::value> DUMP_SUB_FUNCTION(T x) {
		cerr << '\'' << x << '\'';
	}
	template<class T, class U = remove_const_t<remove_reference_t<T>>>
	static enable_if_t<is_same<U, string>::value> DUMP_SUB_FUNCTION(T x) {
		cerr << '\"' << x << '\"';
	}
	template<class T>
	static enable_if_t<is_same<T, const char*>::value> DUMP_SUB_FUNCTION(T x) {
		cerr << string(x);
	}
	template<class T>
	static enable_if_t<true> DUMP_SUB_FUNCTION(vector<T> x) {
		cerr << '{';
		for (size_t i = 0; i < x.size(); i++) {
			if (i) cerr << ", ";
			DUMP_SUB_FUNCTION(x[i]);
		}
		cerr << '}';
	}
	template<class T, size_t N>
	static enable_if_t<true> DUMP_SUB_FUNCTION(array<T, N> x) {
		cerr << '{';
		for (size_t i = 0; i < x.size(); i++) {
			if (i) cerr << ", ";
			DUMP_SUB_FUNCTION(x[i]);
		}
		cerr << '}';
	}
	template<class T>
	static enable_if_t<true> DUMP_SUB_FUNCTION(set<T> x) {
		cerr << '[';
		size_t i = 0;
		for (auto itr = x.begin(); itr != x.end(); itr++, i++) {
			if (i) cerr << ", ";
			DUMP_SUB_FUNCTION(*itr);
		}
		cerr << ']';
	}
	template<class T, class U>
	static enable_if_t<true> DUMP_SUB_FUNCTION(map<T, U> x) {
		cerr << '[';
		size_t i = 0;
		for (auto itr = x.begin(); itr != x.end(); itr++, i++) {
			if (i) cerr << ", ";
			DUMP_SUB_FUNCTION(itr->first);
			cerr << " : ";
			DUMP_SUB_FUNCTION(itr->second);
		}
		cerr << ']';
	}
	template<class T, class U = remove_const_t<remove_reference_t<T>>>
	static enable_if_t<is_floating_point<U>::value> DUMP_SUB_FUNCTION(T x) {
		cerr << fixed << setprecision(5) << x;
	}
	template<class T, class U>
	static enable_if_t<true> DUMP_SUB_FUNCTION(pair<T, U> p) {
		cerr << '(';
		DUMP_SUB_FUNCTION(p.first);
		cerr << ", ";
		DUMP_SUB_FUNCTION(p.second);
		cerr << ')';
	}
	template<int num = 0, class... Args>
	static enable_if_t<num == sizeof...(Args)> DUMP_SUB_FUNCTION(tuple<Args...> t) {
		if (num) cerr << ')';
	}
	template<int num = 0, class... Args>
	static enable_if_t<num < sizeof...(Args)> DUMP_SUB_FUNCTION(tuple<Args...> t) {
		if (num == 0) cerr << '(';
		DUMP_SUB_FUNCTION(get<num>(t));
		if (num + 1 < sizeof...(Args)) cerr << ", ";
		DUMP_SUB_FUNCTION<num+1>(t);
	}
	template<long unsigned N>
	static enable_if_t<true> DUMP_SUB_FUNCTION(bitset<N> x) {
		cerr << x;
	}
};
void dump() {
	cerr << endl;
}
template<class Head, class... Tail>
void dump(Head&& head, Tail&&... tail) {
	DebugPrint::DUMP_SUB_FUNCTION(head);
	if (sizeof...(Tail) != 0) {
		cerr << ' ';
	}
	dump(forward<Tail>(tail)...);
}
} // namespace debug_print_n
using debug_print_n::dump;
#else
template<class... Args> void dump(Args&&... args) { }
#endif

namespace bit {
using u32 = uint_fast32_t;
using u64 = unsigned long long;
template<class T>
constexpr T set(T bin, u32 pos) {
	return bin | (1ull << pos);
}
template<class T>
constexpr T unset(T bin, u32 pos) {
	return bin & ~(1ull << pos);
}
template<class T>
constexpr T get(T bin, u32 pos) {
	return bin & (1ull << pos);
}
template<class T>
constexpr bool check(T bin, u32 pos) {
	return get(bin, pos);
}
constexpr u32 popcount(u64 bin) {
	return __builtin_popcountll(bin);
}
} // namespace bit

/**
 * @title BIT (Binary Indexed Tree)
 * @brief 0-indexed 半開区間で扱う。フェニック木 (Fenwick Tree) とも呼ばれる。
 */
template<class T>
struct BIT {
	int n;
	vector<T> bit;
	// @brief 長さ N で初期化 O(N)$
	BIT(int n_) : n(n_), bit(n) {}
	// @brief vector で初期化 O(N)$
	BIT(const vector<T>& v) :n(v.size()), bit(v) {
		for (int i = 0; i < n-1; i++) if ((i | (i + 1)) < n) bit[i | (i + 1)] += bit[i];
	}
	// @brief i 番目の要素に v を足す O(\log N)$
	 // 0-indexed
	void add(int i, T v) {
		for (; i < n; i |= i + 1) bit[i] += v;
	}
	// @brief [0, i) の区間の和 の計算 O(\log N)$
	 // 0-indexed 半開区間
	T get(int i) {
		T res = 0;
		for (i--; i >= 0; i = (i & (i + 1)) - 1) res += bit[i];
		return res;
	}
	// @brief [i, j) の区間の和 の計算 O(\log N)$
	 // 0-indexed 半開区間
	T get(int i, int j) {
		return get(j) - get(i);
	}
};

signed main(){
	int N, Q; cin >> N >> Q;
	vector<tuple<int, int, int>> LR;
	vector<unsigned int> c(N);
	rep(i, N) cin >> c[i], c[i]--;
	rep(i, Q) {
		int l, r; cin >> l >> r; l--;
		LR.emplace_back(l, r, i);
	}
	sort(all(LR), [](auto& a, auto& b) {
		return get<1>(a) < get<1>(b);
	});
	vector<int> LA(N, -1);
	vector<int> res(Q);
	BIT<int> B(N);
	int r = 0;
	for (auto [L, R, I] : LR) {
		while (r < R) {
			if (LA[c[r]] >= 0) B.add(LA[c[r]], -1);
			LA[c[r]] = r;
			B.add(r, 1);
			r++;
		}
		res[I] = B.get(L, R);
	}
	rep(i, Q) {
		cout << res[i] << endl;
	}
}


Measured memory_bytes: 17352