#include<bits/stdc++.h>
using namespace std;
struct SuccinctIndexableDictionary
{
    int length;
    int blocks;
    vector< unsigned > bit, sum;
 
    SuccinctIndexableDictionary() = default;
 
    SuccinctIndexableDictionary(int length) : length(length), blocks((length + 31) >> 5) {
        bit.assign(blocks, 0U);
        sum.assign(blocks, 0U);
    }
 
    void set(int k) {
        bit[k >> 5] |= 1U << (k & 31);
    }
 
    void build() {
        sum[0] = 0U;
        for(int i = 1; i < blocks; i++) {
        sum[i] = sum[i - 1] + __builtin_popcount(bit[i - 1]);
        }
    }
 
    bool operator[](int k) {
        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 val, int k) {
        return (val ? rank(k) : k - rank(k));
    }
};
 
template< typename T, int MAXLOG >
struct WaveletMatrix
{
    int length;
    SuccinctIndexableDictionary matrix[MAXLOG];
    int mid[MAXLOG];
 
    WaveletMatrix() = default;
 
    WaveletMatrix(vector< T > v) : length(v.size()) {
        vector< T > l(length), r(length);
        for(int level = MAXLOG - 1; level >= 0; level--) {
        matrix[level] = SuccinctIndexableDictionary(length + 1);
        int left = 0, right = 0;
        for(int i = 0; i < length; i++) {
            if(((v[i] >> level) & 1)) {
            matrix[level].set(i);
            r[right++] = v[i];
            } else {
            l[left++] = v[i];
            }
        }
        mid[level] = left;
        matrix[level].build();
        v.swap(l);
        for(int i = 0; i < right; i++) {
            v[left + i] = r[i];
        }
        }
    }
 
    pair< int, int > succ(bool f, int l, int r, int level) {
        return {matrix[level].rank(f, l) + mid[level] * f, matrix[level].rank(f, r) + mid[level] * f};
    }
 
    // v[k]
    T access(int k) {
        T ret = 0;
        for(int level = MAXLOG - 1; level >= 0; level--) {
        bool f = matrix[level][k];
        if(f) ret |= T(1) << level;
        k = matrix[level].rank(f, k) + mid[level] * f;
        }
        return ret;
    }
 
    T operator[](const int &k) {
        return access(k);
    }
 
    // count i s.t. (0 <= i < r) && v[i] == x
    int rank(const T &x, int r) {
        int l = 0;
        for(int level = MAXLOG - 1; level >= 0; level--) {
        tie(l, r) = succ((x >> level) & 1, l, r, level);
        }
        return r - l;
    }
 
    // k-th(0-indexed) smallest number in v[l,r)
    T kth_smallest(int l, int r, int k) {
        assert(0 <= k && k < r - l);
        T ret = 0;
        for(int level = MAXLOG - 1; level >= 0; level--) {
        int cnt = matrix[level].rank(false, r) - matrix[level].rank(false, l);
        bool f = cnt <= k;
        if(f) {
            ret |= T(1) << level;
            k -= cnt;
        }
        tie(l, r) = succ(f, l, r, level);
        }
        return ret;
    }
 
    // k-th(0-indexed) largest number in v[l,r)
    T kth_largest(int l, int r, int k) {
        return kth_smallest(l, r, r - l - k - 1);
    }
 
    // count i s.t. (l <= i < r) && (v[i] < upper)
    int range_freq(int l, int r, T upper) {
        int ret = 0;
        for(int level = MAXLOG - 1; level >= 0; level--) {
        bool f = ((upper >> level) & 1);
        if(f) ret += matrix[level].rank(false, r) - matrix[level].rank(false, l);
        tie(l, r) = succ(f, l, r, level);
        }
        return ret;
    }
 
    // count i s.t. (l <= i < r) && (lower <= v[i] < upper)
    int range_freq(int l, int r, T lower, T upper) {
        return range_freq(l, r, upper) - range_freq(l, r, lower);
    }
 
    // max v[i] s.t. (l <= i < r) && (v[i] < upper)
    T prev_value(int l, int r, T upper) {
        int cnt = range_freq(l, r, upper);
        return cnt == 0 ? T(-1) : kth_smallest(l, r, cnt - 1);
    }
 
    // min v[i] s.t. (l <= i < r) && (lower <= v[i])
    T next_value(int l, int r, T lower) {
        int cnt = range_freq(l, r, lower);
        return cnt == r - l ? T(-1) : kth_smallest(l, r, cnt);
    }
};
#define rep(i,N) for(int i=0;i<(int)N;i++)
static inline void PUT(char c)
{
  static char buf[1<<15],*ptr=buf;
  if(ptr==buf+strlen(buf)||c==0){fwrite(buf,1,ptr-buf,stdout),ptr=buf;}*ptr++=c;
}
static inline int IN(void)
{
  int x=0,f=0,c=getchar();while(c<48||c>57){f^=c==45,c=getchar();}
  while(c>47&&c<58){x=x*10+c-48,c=getchar();}return f?-x:x;
}
static inline void OUT(int a)
{
  if(a<0)PUT('-'),a=-a;
  int d[40],i=0;do{d[i++]=a%10;}while(a/=10);
  while(i--){PUT(d[i]+48);}PUT('\n');
}
int main()
{
  int N=IN(),Q=IN(),mn=N,mx=0,C[N],temp[N];
  vector<int>direction(N);
  rep(i,N){C[i]=IN();mn=mn<C[i]?mn:C[i];mx=mx>C[i]?mx:C[i];temp[i]=N;}
  rep(i,N){direction[N-1-i]=temp[C[N-1-i]-1];temp[C[N-1-i]-1]=N-1-i;}
  WaveletMatrix<int,20> wm(direction);
  while(Q--){int l=IN()-1,r=IN();OUT(wm.range_freq(l,r,r,N+1));}
}

Measured memory_bytes: 17272