import java.util.*;
import java.io.*;
import java.math.BigInteger;
import java.text.*;
public class Main {
    static int mod = 1000_000_007;
    static long lim = (long)1e9 + 6;
    static long mod1 = 998244353;
    static boolean fileIO = false;
    static FastScanner f;
    static int inf = 1000_000_000;
    static PrintWriter pw = new PrintWriter(System.out);
    static Scanner S = new Scanner(System.in);
    static long x0; static long y0;
    static int MAX = 1000001;
    public static class Query { 
        int l, r, idx;
    } 
  
    static void update(int idx, int val, int bit[], int n) { 
        for (; idx <= n; idx += idx & -idx) 
            bit[idx] += val; 
    } 

    static int query(int idx, int bit[], int n) { 
        int sum = 0; 
        for (; idx > 0; idx -= idx & -idx) 
            sum += bit[idx]; 
        return sum; 
    } 
  
    static void answeringQueries(int[] arr, int n, Query[] queries, int q) { 
        int[] bit = new int[n + 1]; 
        Arrays.fill(bit, 0); 
        int[] last_visit = new int[MAX]; 
        Arrays.fill(last_visit, -1); 
        int[] ans = new int[q]; 
        int query_counter = 0; 
        for (int i = 0; i < n; ++i) {
            if (last_visit[arr[i]] != -1) 
                update(last_visit[arr[i]] + 1, -1, bit, n);  
            last_visit[arr[i]] = i; 
            update(i + 1, 1, bit, n);
            while (query_counter < q && queries[query_counter].r == i) { 
                ans[queries[query_counter].idx] =  query(queries[query_counter].r + 1, bit, n) - query(queries[query_counter].l, bit, n); 
                ++query_counter; 
            } 
        } 
        for (int i = 0; i < q; ++i) pn(ans[i]);
    } 
    static void solve()throws IOException {
        int n = f.ni(); int q = f.ni();
        int a[] = new int[n];
        for (int i = 0; i < n; ++i) a[i] = f.ni();
        Query queries[] = new Query[q];
        for (int i = 0; i < q; ++i) 
            queries[i] = new Query(); 
        for (int i = 0; i < q; ++i) {
            int l = f.ni() - 1; int r = f.ni() - 1;
            queries[i].l = l;
            queries[i].r = r;
            queries[i].idx = i;
        } 
        Arrays.sort(queries, new Comparator<Query>() { 
            public int compare(Query x , Query y) { 
                if (x.r < y.r) 
                    return -1; 
                else if (x.r == y.r) 
                    return 0; 
                else
                    return 1; 
            } 
        }); 
        answeringQueries(a , n , queries , q);
    }
    public static void main(String[] args)throws IOException {
        init();
        int t = 1;
        int tt = 1;
        while(t --> 0) {
            solve();
        }
        pw.flush(); 
        pw.close();
    }
        
/******************************END OF MAIN PROGRAM*******************************************/
    public static void init()throws IOException{if(fileIO){f=new FastScanner("");}else{f=new FastScanner(System.in);}}
    public static class FastScanner {
        BufferedReader br;StringTokenizer st;
        FastScanner(InputStream stream){try{br=new BufferedReader(new InputStreamReader(stream));}catch(Exception e){e.printStackTrace();}}
        FastScanner(String str){try{br=new BufferedReader(new FileReader("!a.txt"));}catch(Exception e){e.printStackTrace();}}
        String next(){while(st==null||!st.hasMoreTokens()){try{st=new StringTokenizer(br.readLine());}catch(IOException e){e.printStackTrace();}}return st.nextToken();}
        String nextLine()throws IOException{String fl=null;while(st==null||!st.hasMoreTokens()){try{fl=br.readLine();}catch(IOException e){throw new RuntimeException(e);}return fl;}return fl;}
        int ni(){return Integer.parseInt(next());}long nl(){return Long.parseLong(next());}double nextDouble(){return Double.parseDouble(next());}
    }
    public static void pn(Object o){pw.println(o);}
    public static void pi(Object o){pw.print(o);pw.flush();}
    public static void p(Object o){pw.print(o);}
    public static void pni(Object o){pw.println(o);pw.flush();}
    static int gcd(int a,int b){if(b==0)return a;else{return gcd(b,a%b);}}
    static long gcd(long a,long b){if(b==0l)return a;else{return gcd(b,a%b);}}
    static long lcm(long a,long b){return (a*b/gcd(a,b));}
    static long exgcd(long a,long b){if(b==0){x0=1;y0=0;return a;}long temp=exgcd(b,a%b);long t=x0;x0=y0;y0=t-a/b*y0;return temp;}
    static long pow(long a,long b){long res=1;while(b>0){if((b&1)==1)res=res*a;b>>=1;a=a*a;}return res;}
    static long mpow(long a,long b){long res=1;while(b>0){if((b&1)==1)res=((res%mod)*(a%mod))%mod;b>>=1;a=((a%mod)*(a%mod))%mod;}return res;}
    static long mul(long a , long b){return ((a%mod)*(b%mod)%mod);}
    static long adp(long a , long b){return ((a%mod)+(b%mod)%mod);}
    static boolean isPrime(long n){if(n<=1)return false;if(n<=3)return true;if(n%2==0||n%3==0)return false;for(long i=5;i*i<=n;i=i+6)if(n%i==0||n%(i+2)==0)return false;return true;}
    static boolean isPrime(int n){if(n<=1)return false;if(n<=3)return true;if(n%2==0||n%3==0)return false;for(int i=5;i*i<=n;i=i+6)if(n%i==0||n%(i+2)==0)return false;return true;}
    static HashSet<Long> factors(long n){HashSet<Long> hs=new HashSet<Long>();for(long i=1;i<=(long)Math.sqrt(n);i++){if(n%i==0){hs.add(i);hs.add(n/i);}}return hs;}
    static HashSet<Integer> factors(int n){HashSet<Integer> hs=new HashSet<Integer>();for(int i=1;i<=(int)Math.sqrt(n);i++){if(n%i==0){hs.add(i);hs.add(n/i);}}return hs;}
    static HashSet<Long> pf(long n){HashSet<Long> ff=factors(n);HashSet<Long> ans=new HashSet<Long>();for(Long i:ff)if(isPrime(i))ans.add(i);return ans;}
    static HashSet<Integer> pf(int n){HashSet<Integer> ff=factors(n);HashSet<Integer> ans=new HashSet<Integer>();for(Integer i:ff)if(isPrime(i))ans.add(i);return ans;}
    static int[] inpint(int n){int arr[]=new int[n];for(int i=0;i<n;i++){arr[i]=f.ni();}return arr;}
    static long[] inplong(int n){long arr[] = new long[n];for(int i=0;i<n;i++){arr[i]=f.nl();}return arr;}
    static boolean ise(int x){return ((x&1)==0);}static boolean ise(long x){return ((x&1)==0);}
    static int gnv(char c){return Character.getNumericValue(c);}
    static int log(long x){return x==1?0:(1+log(x/2));} static int log(int x){return x==1?0:(1+log(x/2));}
    static void sort(int[] a){ArrayList<Integer> l=new ArrayList<>();for(int i:a)l.add(i);Collections.sort(l);for(int i=0;i<a.length;++i)a[i]=l.get(i);}
    static void sort(long[] a){ArrayList<Long> l=new ArrayList<>();for(long i:a)l.add(i);Collections.sort(l);for(int i=0;i<a.length;++i)a[i]=l.get(i);}
    static void sort(ArrayList<Integer> a){Collections.sort(a);}
}


Measured memory_bytes: 89488