/*
    Author: Anthony Ngene
    Created: 03/08/2020 - 15:59
*/

import java.io.*;
import java.util.*;

public class Main {
    // The greatest discovery of all time is that a person can change his future by merely changing his attitude. - Oprah Winfrey
    public static void main(String[] args) throws IOException {
        in = new FastScanner();

        int n = in.intNext(), q = in.intNext();
        int[] arr = in.nextIntArray(n);

        HashMap<Integer, Integer> lastSeen = new HashMap<>();
        HashMap<Integer, Query> queryIdx = new HashMap<>();
        HashMap<Integer, ArrayList<Query>> queryEnds = new HashMap<>();
        for (int i = 0; i < q; i++) {
            int l = in.intNext(), r = in.intNext();
            Query query = new Query(l, r);
            queryIdx.put(i, query);
            if (!queryEnds.containsKey(r)) queryEnds.put(r, new ArrayList<>());
            queryEnds.get(r).add(query);
        }
        BIT fenwick = new BIT(n);
        for (int i = 0; i < n; i++) {
            int num = arr[i];
            if (lastSeen.containsKey(num)) {
                fenwick.update(lastSeen.get(num), -1);
            }
            lastSeen.put(num, i + 1);
            fenwick.update(i + 1, 1);
            if (queryEnds.containsKey(i + 1)) {
                for (Query query: queryEnds.get(i + 1))
                    query.ans = fenwick.rangeSum(query.left, query.right);
            }
        }
        for (int i = 0; i < q; i++) out.println(queryIdx.get(i).ans);

        out.close();
    }

    static class Query {
        int left;
        int right;
        long ans;
        public Query(int l, int r){
            this.left = l;
            this.right = r;
        }
    }

    static class BIT {
        int[] tree;
        int n;
        public BIT(int n) {
            this.n = n;
            tree = new int[n + 1];
        }
        public BIT(int[] arr) {
            this.n = arr.length;
            tree = new int[n + 1];
            for (int i = 0; i < n; i++) tree[i + 1] = arr[i];
            for (int i = 1; i < n + 1; i++) {
                int parent = i + (i & -i);
                if (parent <= n) tree[parent] += tree[i];
            }
        }

        public long getSum(int idx) {
            // one indexed
            long total = 0;
            while (idx > 0) {
                total += tree[idx];
                idx = idx - (idx & -idx);
            }
            return total;
        }

        public long rangeSum(int a, int b) {
            // a-b inclusive: b > a and one indexed.
            return getSum(b) - getSum(a - 1);
        }

        public void update(int idx, int valueToAdd) {
            // one indexed
            while (idx <= n) {
                tree[idx] += valueToAdd;
                idx = idx + (idx & -idx);
            }
        }
    }

private static final FastWriter out = new FastWriter();
private static FastScanner in;
static ArrayList<Integer>[] adj;
private static long e97 = (long)1e9 + 7;
static class FastWriter {
    private static final int IO_BUFFERS = 128 * 1024;
    private final StringBuilder out;
    public FastWriter() {
        out = new StringBuilder(IO_BUFFERS);
    }
    public FastWriter p(Object object) {
        out.append(object);
        return this;
    }
    public FastWriter p(String format, Object... args) {
        out.append(String.format(format, args));
        return this;
    }
    public FastWriter pp(Object... args) {
        for (Object ob : args) {
            out.append(ob).append(" ");
        }
        out.append("\n");
        return this;
    }
    public FastWriter println(Object object) {
        out.append(object).append("\n");
        return this;
    }
    public void toFile(String fileName) throws IOException {
        BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
        writer.write(out.toString());
        writer.close();
    }
    public void close() throws IOException {
        System.out.print(out);
    }
}
static class FastScanner {
    private InputStream sin = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public FastScanner(){}
    public FastScanner(String filename) throws FileNotFoundException {
        File file = new File(filename);
        sin = new FileInputStream(file);
    }
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = sin.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long longNext() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b) || b == ':'){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int intNext() {
        long nl = longNext();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double doubleNext() { return Double.parseDouble(next());}
    public long[] nextLongArray(final int n){
        final long[] a = new long[n];
        for (int i = 0; i < n; i++)
            a[i] = longNext();
        return a;
    }
    public int[] nextIntArray(final int n){
        final int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = intNext();
        return a;
    }
    public ArrayList<Integer>[] getAdj(int n) {
        ArrayList<Integer>[] adj = new ArrayList[n + 1];
        for (int i = 1; i <= n; i++) adj[i] = new ArrayList<>();
        return adj;
    }

    public ArrayList<Integer>[] adjacencyList(int n, int m) throws IOException {
        adj = getAdj(n);
        for (int i = 0; i < m; i++) {
            int a = intNext(), b = intNext();
            adj[a].add(b);
            adj[b].add(a);
        }
        return adj;
    }
}
}


Measured memory_bytes: 247568