#ifndef __BIT_H__
#define __BIT_H__

/* updated: 2019-10-03 */

#include <vector>
#include <cstdint>

class BinaryIndexedTree {
	using T = uint64_t;

private:
	const int size_m;
	std::vector<T> arr_m;

	static const int Default = -1;

public:
	explicit BinaryIndexedTree(int size);
	void add(int pos, T increment);
	T sum(int left) const;
	T sum(int left, int right) const;
	T get(int pos) const;

	void debug(int size = Default) const;
};

#endif

#ifdef ONLY_MY_ENVIR
#include "BIT.h"
#endif

#include <cassert>
#include <iostream>

/* 長さ size の BIT を作成 */
BinaryIndexedTree::BinaryIndexedTree(int size)
	: size_m(size), arr_m(size) {
}

/* pos 番目の要素を increment 増加させる O(log n) */
void BinaryIndexedTree::add(int pos, T increment) {
	for (int i = pos; i != 0; i &= ~(-i)) {
		arr_m[i] += increment;
	}
	arr_m[0] += increment;
}

/* [left, ∞) に存在する全要素の和をとる O(log n) */
BinaryIndexedTree::T BinaryIndexedTree::sum(int left) const {
	if (left == 0) return arr_m[0];		// 0番目の要素は例外

	T sum = T();
	for (int i = left; i < size_m; i += i & -i) {
		sum += arr_m[i];
	}
	return sum;
}

/* [left, right) に存在する全要素の和をとる O(log n) */
BinaryIndexedTree::T BinaryIndexedTree::sum(int left, int right) const {
	assert(left <= right);

	return sum(left) - sum(right);
}

/* pos 番目の要素を直接取得 O(log n) */
BinaryIndexedTree::T BinaryIndexedTree::get(int pos) const {
	return sum(pos, pos + 1);
}

/* デバッグ出力用; size = -1 とすると全要素出力 */
void BinaryIndexedTree::debug(int size) const {
	if (size == Default) {			// デフォルト値への対処
		size = size_m;
	}

	if (size > size_m) {
		size = size_m;
	}

	std::cout << "{ ";
	for (int i = 0; i < size; ++i) {
		std::cout << arr_m[i] << ' ';
	}
	std::cout << "}" << std::endl;
}


#define _CRT_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <iostream>
#include <string>
#include <vector>
#include <list>
#include <utility>
#include <algorithm>
#include <functional>
#include <cmath>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <iomanip>
#include <sstream>
#include <bitset>
#include <limits>
#include <numeric>
#include <valarray>
#include <fstream>
#include <array>
#include <random>
#include <unordered_set>
#include <unordered_map>

using namespace std;
using uint = uint32_t;
using LL = int64_t;
using ULL = uint64_t;
using PP = pair<LL, LL>;
template <typename T> using PriorityQ = priority_queue<T, vector<T>, greater<T> >;
#define REP(i, a, n) for(LL i = (a), i##_max_ = (n); i < i##_max_; ++i)
#define REM(i, a, n) for(LL i = (LL)(n) - 1, i##_min_ = (a); i >= i##_min_; --i)
#define FLOAT fixed << setprecision(16)
#define SPEEDUP { cin.tie(NULL); ios::sync_with_stdio(false); }
const int INF = 0x3FFFFFFF;
const LL INFLL = 0x3FFFFFFF3FFFFFFF;
const double INFD = 1.0e+308;
const double EPS = 1.0e-9;

void YesNo(bool b) { cout << (b ? "Yes" : "No") << endl; }
void YESNO(bool b) { cout << (b ? "YES" : "NO") << endl; }
template <class T, class U> istream& operator>>(istream& ist, pair<T, U>& right) { return ist >> right.first >> right.second; }
template <class T, class U> ostream& operator<<(ostream& ost, const pair<T, U>& right) { return ost << right.first << ' ' << right.second; }
template <class T, class TCompatible, size_t N> void Fill(T(&dest)[N], const TCompatible& val) { fill(dest, dest + N, val); }
template <class T, class TCompatible, size_t M, size_t N> void Fill(T(&dest)[M][N], const TCompatible& val) { for (int i = 0; i < M; ++i) Fill(dest[i], val); }
template <class T> T Next() { T buf; cin >> buf; return buf; }
istream& Ignore(istream& ist) { string s; ist >> s; return ist; }
bool Inside(int i, int j, int h, int w) { return i >= 0 && i < h&& j >= 0 && j < w; }

#ifdef ONLY_MY_ENVIR
#include "Accumulator.h"
#include "Algebraic.h"
#include "BinaryMatrix.h"
#include "BinaryTree.h"
#include "Bipartite.h"
#include "BIT.h"
#include "Compressor.h"
#include "Decompositions.h"
#include "DiscreteLog.h"
#include "DynamicMod.h"
#include "Exponential.h"
#include "Factorization.h"
#include "FFT.h"
#include "FlowSolver.h"
#include "Geometric2D.h"
#include "Geometric2DFloat.h"
#include "Geometric3D.h"
#include "Geometric3DFloat.h"
#include "Graph.h"
#include "GraphUtil.h"
#include "Interpolation.h"
#include "IntMod.h"
#include "KDTree.h"
#include "LazySegmentTree.h"
#include "LIS.h"
#include "List.h"
#include "Math.h"
#include "MathUtil.h"
#include "Matrix.h"
#include "MinCostFlowSolver.h"
#include "MinMax.h"
#include "Numbers.h"
#include "Optimize.h"
#include "Permutation.h"
#include "Polynomial.h"
#include "Position.h"
#include "Random.h"
#include "Range.h"
#include "Rational.h"
#include "RuntimeMod.h"
#include "SegmentTree.h"
#include "SegmentTree2D.h"
#include "Sets.h"
#include "Shortest.h"
#include "SlidingWindow.h"
#include "SpanningTree.h"
#include "StringSearching.h"
#include "SuffixArray.h"
#include "SwitchList.h"
#include "Timer.h"
#include "Tree.h"
#include "TreeUtil.h"
#include "UnionFind.h"
#include "Util.h"
#include "VectorUtil.h"
#endif

#ifdef __GNUC__
typedef __int128 LLL;
istream& operator>>(istream& ist, __int128& val) { LL tmp; ist >> tmp; val = tmp; return ist; }
ostream& operator<<(ostream& ost, __int128 val) { LL tmp = val; ost << tmp; return ost; }
#endif

struct Query {
	int id, l, r;
};

int n, q;
int col[500000];
Query qs[500000];
int ans[500000];
int main() {
	cin >> n >> q;
	REP(i, 0, n) {
		cin >> col[i];
		--col[i];
	}

	REP(k, 0, q) {
		int l, r;
		cin >> l >> r;
		--l;
		qs[k] = Query{ (int)k, l, r };
	}

	sort(qs, qs + q, [](const Query& a, const Query& b) {
		return a.r < b.r;
	});
	
	BinaryIndexedTree bit(n);
	vector<int> pos(n, -1);
	
	int curr_r = 0;
	REP(k, 0, q) {
		int l = qs[k].l;
		int r = qs[k].r;

		while (curr_r < r) {
			int c = col[curr_r];
			int p = pos[c];
			if (p != -1) bit.add(p, -1);
			pos[c] = curr_r;
			bit.add(curr_r, 1);
			++curr_r;
		}

		int id = qs[k].id;
		ans[id] = bit.sum(l, r);
	}

	REP(k, 0, q) {
		cout << ans[k] << endl;
	}
	return 0;
}



Measured memory_bytes: 19304