# Original solution

import sys
input = sys.stdin.readline
def main():
  n,q=map(int,input().split())
  c=list(map(int,input().split()))
  lr=[list(map(int,input().split())) for _ in range(q)]
  lri=[[lr[i][0],lr[i][1],i] for i in range(q)]
  lri.sort(key=lambda x:x[1])
  def segfunc(x, y):
    return x+y
  #################

  #####ide_ele#####
  ide_ele=0
  #################

  class SegTree:
    """
    init(init_val, ide_ele): 配列init_valで初期化 O(N)
    update(k, x): k番目の値をxに更新 O(logN)
    query(l, r): 区間[l, r)をsegfuncしたものを返す O(logN)
    """
    def __init__(self, init_val, segfunc=segfunc, ide_ele=ide_ele):
      """
      init_val: 配列の初期値
      segfunc: 区間にしたい操作
      ide_ele: 単位元
      n: 要素数
      num: n以上の最小の2のべき乗
      tree: セグメント木(1-index)
      """
      n = len(init_val)
      self.segfunc = segfunc
      self.ide_ele = ide_ele
      self.num = 1 << (n - 1).bit_length()
      self.tree = [ide_ele] * 2 * self.num
      # 配列の値を葉にセット
      for i in range(n):
        self.tree[self.num + i] = init_val[i]
      # 構築していく
      for i in range(self.num - 1, 0, -1):
        self.tree[i] = self.segfunc(self.tree[2 * i], self.tree[2 * i + 1])

    def update(self, k, x):
      """
      k番目の値をxに更新
      k: index(0-index)
      x: update value
      """
      k += self.num
      self.tree[k] = x
      while k > 1:
        self.tree[k >> 1] = self.segfunc(self.tree[k], self.tree[k ^ 1])
        k >>= 1

    def query(self, l, r):
      """
      [l, r)のsegfuncしたものを得る
      l: index(0-index)
      r: index(0-index)
      """
      res = self.ide_ele
      l += self.num
      r += self.num
      while l < r:
        if l & 1:
          res = self.segfunc(res, self.tree[l])
          l += 1
        if r & 1:
          res = self.segfunc(res, self.tree[r - 1])
        l >>= 1
        r >>= 1
      return res
  st=SegTree([0]*(n+1))
  dc={}
  ans=[0]*q
  j=0
  for i in range(n):
    x=c[i]
    if x in dc:
      st.update(dc[x],0)
    st.update(i+1,1)
    dc[x]=i+1
    while j<q and i+1==lri[j][1]:
      l,r,k=lri[j]
      ans[k]=st.query(l,r+1)
      j+=1
    if j==q:break
  print(*ans,sep='\n')


if __name__=='__main__':
  #import datetime
  #print(datetime.datetime.now())
  main()
  #print(datetime.datetime.now())


# Optimized solution

import sys
input = sys.stdin.readline
def main():
  n,q=map(int,input().split())
  c=list(map(int,input().split()))
  lr=[list(map(int,input().split())) for _ in range(q)]
  lri=[[lr[i][0],lr[i][1],i] for i in range(q)]
  lri.sort(key=lambda x:x[1])
  
  class BIT:
      def __init__(self, n):
          self.n = n
          self.data = [0]*(n+1)
          self.el = [0]*(n+1)
      def sum(self, i):
          s = 0
          while i > 0:
              s += self.data[i]
              i -= i & -i
          return s
      def add(self, i, x):
          # assert i > 0
          self.el[i] += x
          while i <= self.n:
              self.data[i] += x
              i += i & -i
      def get(self, i, j=None):
          if j is None:
              return self.el[i]
          return self.sum(j) - self.sum(i)

  bt=BIT(n+1)
  dc={}
  ans=[0]*q
  j=0
  for i in range(n):
    x=c[i]
    if x in dc:
      bt.add(dc[x],-1)
    bt.add(i+1,1)
    dc[x]=i+1
    while j<q and i+1==lri[j][1]:
      l,r,k=lri[j]
      ans[k]=bt.get(l-1,r)
      j+=1
    if j==q:break
  print(*ans,sep='\n')


if __name__=='__main__':
  #import datetime
  #print(datetime.datetime.now())
  main()
  #print(datetime.datetime.now())