/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author aajisaka
 */

#include<bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}
#ifdef LOCAL
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SPEED ios_base::sync_with_stdio(false);cin.tie(nullptr)
#define rep(i,n) for(int i=0; i<(int)(n); i++)
#define all(v) v.begin(), v.end()
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

using ll = long long;
using ull = unsigned long long;
using P = pair<ll, ll>;

constexpr long double PI = 3.14159265358979323846264338327950288L;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
// Original: https://github.com/beet-aizu/library
// BEGIN
struct FullyIndexableDictionary{
    int len,blk;
    vector<unsigned> bit;
    vector<int> sum;

    FullyIndexableDictionary(){}
    FullyIndexableDictionary(int len)
        :len(len),blk((len+31)>>5),bit(blk,0),sum(blk,0){}

    void set(int k){
      bit[k>>5]|=1u<<(k&31);
    }

    void build(){
      sum[0]=0;
      for(int i=1;i<blk;i++)
        sum[i]=sum[i-1]+__builtin_popcount(bit[i-1]);
    }

    bool operator[](int k) const{
      return bool((bit[k>>5]>>(k&31))&1);
    }

    int rank(int k){
      return sum[k>>5]+__builtin_popcount(bit[k>>5]&((1u<<(k&31))-1));
    }

    int rank(bool v,int k){
      return (v?rank(k):k-rank(k));
    }

    int select(bool v,int k){
      if(k<0||rank(v,len)<=k) return -1;
      int l=0,r=len;
      while(l+1<r){
        int m=(l+r)>>1;
        if(rank(v,m)>=k+1) r=m;
        else l=m;
      }
      return r-1;
    }

    int select(bool v,int i,int l){
      return select(v,i+rank(v,l));
    }
};

template<class T,int MAXLOG>
struct WaveletMatrix{
    int len;
    FullyIndexableDictionary mat[MAXLOG];
    int zs[MAXLOG],buff1[MAXLOG],buff2[MAXLOG];
    static const T npos=-1;

    int freq_dfs(int d,int l,int r,T val,T a,T b){
      if(l==r) return 0;
      if(d==MAXLOG) return (a<=val&&val<b)?r-l:0;
      T nv=T(1)<<(MAXLOG-d-1)|val;
      T nnv=((T(1)<<(MAXLOG-d-1))-1)|nv;
      if(nnv<a||b<=val) return 0;
      if(a<=val&&nnv<b) return r-l;
      int lc=mat[d].rank(1,l),rc=mat[d].rank(1,r);
      return freq_dfs(d+1,l-lc,r-rc,val,a,b)
             +freq_dfs(d+1,lc+zs[d],rc+zs[d],nv,a,b);
    }

    WaveletMatrix(vector<T> data){
      len=data.size();
      vector<T> ls(len),rs(len);
      for(int dep=0;dep<MAXLOG;dep++){
        mat[dep]=FullyIndexableDictionary(len+1);
        int p=0,q=0;
        for(int i=0;i<len;i++){
          bool k=(data[i]>>(MAXLOG-(dep+1)))&1;
          if(k) rs[q++]=data[i],mat[dep].set(i);
          else  ls[p++]=data[i];
        }
        zs[dep]=p;
        mat[dep].build();
        swap(ls,data);
        for(int i=0;i<q;i++) data[p+i]=rs[i];
      }
    }

    T access(int k){
      T res=0;
      for(int dep=0;dep<MAXLOG;dep++){
        bool bit=mat[dep][k];
        res=(res<<1)|bit;
        k=mat[dep].rank(bit,k)+zs[dep]*dep;
      }
      return res;
    }

    // return the number of v in [0,k)
    int rank(T v,int k){
      int l=0,r=k;
      for(int dep=0;dep<MAXLOG;dep++){
        buff1[dep]=l;buff2[dep]=r;
        bool bit=(v>>(MAXLOG-(dep+1)))&1;
        l=mat[dep].rank(bit,l)+zs[dep]*bit;
        r=mat[dep].rank(bit,r)+zs[dep]*bit;
      }
      return r-l;
    }

    // return the position of k-th v
    int select(T v,int k){
      rank(v,len);
      for(int dep=MAXLOG-1;dep>=0;dep--){
        bool bit=(v>>(MAXLOG-(dep+1)))&1;
        k=mat[dep].select(bit,k,buff1[dep]);
        if(k>=buff2[dep]||k<0) return -1;
        k-=buff1[dep];
      }
      return k;
    }

    int select(T v,int k,int l){
      return select(v,k+rank(v,l));
    }

    // return k-th largest value in [l,r)
    // k=0 means the largest value
    T quantile(int l,int r,int k){
      if(r-l<=k||k<0) return -1;
      T res=0;
      for(int dep=0;dep<MAXLOG;dep++){
        int p=mat[dep].rank(1,l);
        int q=mat[dep].rank(1,r);
        if(q-p>k){
          l=p+zs[dep];
          r=q+zs[dep];
          res|=T(1)<<(MAXLOG-(dep+1));
        }else{
          k-=(q-p);
          l-=p;
          r-=q;
        }
      }
      return res;
    }

    // return k-th smallest value in [l, r)
    // k=0 means the smallest value
    T rquantile(int l,int r,int k){
      return quantile(l,r,r-l-k-1);
    }

    // return number of points in [left, right) * [lower, upper)
    int rangefreq(int left,int right,T lower,T upper){
      return freq_dfs(0,left,right,0,lower,upper);
    }

    pair<int, int> ll(int l,int r,T v){
      int res=0;
      for(int dep=0;dep<MAXLOG;dep++){
        buff1[dep]=l;buff2[dep]=r;
        bool bit=(v>>(MAXLOG-(dep+1)))&1;
        if(bit) res+=r-l+mat[dep].rank(bit,l)-mat[dep].rank(bit,r);
        l=mat[dep].rank(bit,l)+zs[dep]*bit;
        r=mat[dep].rank(bit,r)+zs[dep]*bit;
      }
      return make_pair(res,r-l);
    }

    int lt(int l,int r,T v){
      auto p=ll(l,r,v);
      return p.first;
    }

    int le(int l,int r,T v){
      auto p=ll(l,r,v);
      return p.first+p.second;
    }

    T succ(int l,int r,T v){
      int k=le(l,r,v);
      return k==r-l?npos:rquantile(l,r,k);
    }

    T pred(int l,int r,T v){
      int k=lt(l,r,v);
      return k?rquantile(l,r,k-1):npos;
    }
};
// END

using piii = pair<pair<int, int>, int>;

class FRangeSetQuery {
public:

    void solve(istream& cin, ostream& cout) {
      SPEED;
      int n, q; cin >> n >> q;
      vector<int> c(n);
      rep(i, n) {
        cin >> c[i];
      }
      vector<int> pos(500005, -1);
      vector<int> dp(n);
      rep(i, n) {
        dp[i] = pos[c[i]];
        pos[c[i]] = i;
      }

      auto wm = WaveletMatrix<int, 20>(dp);

      rep(i, q) {
        int l, r; cin >> l >> r;
        l--; r--;
        int d = wm.rangefreq(l, r+1, l, r+1);
        cout << r-l+1 - d << '\n';
      }
    }
};

signed main() {
  FRangeSetQuery solver;
  std::istream& in(std::cin);
  std::ostream& out(std::cout);
  solver.solve(in, out);
  return 0;
}

Measured memory_bytes: 17420