using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
using MethodImplAttribute = System.Runtime.CompilerServices.MethodImplAttribute;
using MethodImplOptions = System.Runtime.CompilerServices.MethodImplOptions;
public static class P
{
    public static void Main()
    {
        var nq = Console.ReadLine().Split().Select(int.Parse).ToArray();
        var n = nq[0];
        var q = nq[1];
        var c = Console.ReadLine().Split().Select(int.Parse).ToArray();
        var queries = Enumerable.Repeat(0, q).Select(_ => Console.ReadLine().Split().Select(int.Parse).ToArray()).ToArray();
        int[] res = new int[q];
        int[] rPos = Enumerable.Repeat(-1, n + 1).ToArray();
        SegmentTree<int> segTree = new SegmentTree<int>(n + 1, 0, (x, y) => x + y);
        var last = 0;
        foreach (var (query, ind) in queries.Select((elem, ind) => (elem, ind)).OrderBy(x => x.elem[1]))
        {
            var l = query[0] - 1;
            var r = query[1] - 1;
            for (int i = last; i <= r; i++)
            {
                if (rPos[c[i]] != -1) segTree[rPos[c[i]]]--;
                segTree[rPos[c[i]] = i]++;
            }
            res[ind] = segTree.Query(l, r);
            last = r + 1;
        }

        Console.WriteLine(string.Join("\n", res));
    }
}


class SegmentTree<T>
{
    public int Size { get; private set; }
    T Identity;
    T[] Data;
    Func<T, T, T> Merge;
    int LeafCount;

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public SegmentTree(int size, T identity, Func<T, T, T> merge)
    {
        Init(size, identity, merge);
        for (int i = 1; i < Data.Length; i++) Data[i] = identity;
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public SegmentTree(T[] elems, T identity, Func<T, T, T> merge)
    {
        Init(elems.Length, identity, merge);
        elems.CopyTo(Data, LeafCount);
        for (int i = elems.Length + LeafCount; i < Data.Length; i++) Data[i] = identity;
        for (int i = LeafCount - 1; i >= 1; i--) Data[i] = Merge(Data[i << 1], Data[(i << 1) | 1]);
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private void Init(int size, T identity, Func<T, T, T> merge)
    {
        Size = size;
        Identity = identity;
        Merge = merge;
        LeafCount = 1;
        while (LeafCount < size) LeafCount <<= 1;
        Data = new T[LeafCount << 1];
    }

    public T this[int index]
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get { return Data[LeafCount + index]; }
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        set { Update(index, value); }
    }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public void Update(int i, T x) { Data[i += LeafCount] = x; while (0 < (i >>= 1)) Data[i] = Merge(Data[i << 1], Data[(i << 1) | 1]); }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public void Operate(int i, T x) { Data[i += LeafCount] = Merge(Data[i], x); while (0 < (i >>= 1)) Data[i] = Merge(Data[i << 1], Data[(i << 1) | 1]); }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public T Query(int l, int r)
    {
        T lRes = Identity, rRes = Identity;
        for (l += LeafCount, r += LeafCount; l <= r; l = (l + 1) >> 1, r = (r - 1) >> 1)
        {
            if ((l & 1) == 1) lRes = Merge(lRes, Data[l]); if ((r & 1) == 0) rRes = Merge(Data[r], rRes);
        }
        return Merge(lRes, rRes);
    }
}


Measured memory_bytes: 111064