Buggy python submission (verdict: Time Limit Exceeded):
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)
class Query:
    def __init__(self, r,l, idx):
        self.l = l
        self.r = r
        self.idx = idx

def solve(case):
    n,q = map(int,input().split())
    c = list(map(int,input().split()))
    query = []
    for i in range(q):
        l,r = map(int,input().split())
        query.append(Query(r,l,i))

    query.sort(key = lambda x:x.r)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind].r == i+1):
            ans[query[ind].idx] = (bit.sum(i+1) - bit.sum(query[ind].l-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

solve(1)


Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)
class Query:
    def __init__(self, r,l, idx):
        self.l = l
        self.r = r
        self.idx = idx

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append(Query(r,l,i))

    query.sort()
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind].r == i+1):
            ans[query[ind].idx] = (bit.sum(i+1) - bit.sum(query[ind].l-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)
class Query:
    def __init__(self, r,l, idx):
        self.l = l
        self.r = r
        self.idx = idx

def solve(case):
    n,q = map(int,input().split())
    c = list(map(int,input().split()))
    query = []
    for i in range(q):
        l,r = map(int,input().split())
        query.append(Query(r,l,i))

    query.sort(key = lambda x:x.r)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind].r == i+1):
            ans[query[ind].idx] = (bit.sum(i+1) - bit.sum(query[ind].l-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

solve(1)


Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)
class Query:
    def __init__(self, r,l, idx):
        self.l = l
        self.r = r
        self.idx = idx

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append(Query(r,l,i))

    query.sort()
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind].r == i+1):
            ans[query[ind].idx] = (bit.sum(i+1) - bit.sum(query[ind].l-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append([r,l,i])

    query.sort()
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query.sort()
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
# class BIT:
#     def __init__(self,n):
#         self.n = n
#         self.tree = [0]*(n+1)
#
#     def sum(self,x):
#         sum = 0
#         while(x>0):
#             sum+=self.tree[x]
#             x-=x&(-x)
#         return sum
#
#     def update(self,x,k):
#         while(x<=self.n):
#             self.tree[x]+=k
#             x+=x&(-x)
#
#     def build(self,a):
#         for i in range(len(a)):
#             k = a[i]
#             x = i+1
#             while(x<=self.n):
#                 self.tree[x]+=k
#                 x+=x&(-x)

class BIT:
    def __init__(self, n):
        self.n = n
        self.data = [0]*(n+1)

    def to_sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= (i & -i)
        return s

    def add(self, i, x):
        while i <= self.n:
            self.data[i] += x
            i += (i & -i)

    def get(self, i, j):
        return self.to_sum(j)-self.to_sum(i-1)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.add(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.add(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.to_sum(i+1) - bit.to_sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    print('\n'.join(str(ans[i]) for i in range(len(ans))))

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    for i in range(q):
        print(ans[i])

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*q
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    for i in range(n):
        print(ans[i])

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

# from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

# from itertools import *
# import bisect
# from heapq import *
# from math import *
# from copy import *
# from collections import deque
# from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
# from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
# from itertools import permutations as permutate
# from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

# from bisect import bisect_right as br
# from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
# from types import GeneratorType
# def iterative(f, stack=[]):
#   def wrapped_func(*args, **kwargs):
#     if stack: return f(*args, **kwargs)
#     to = f(*args, **kwargs)
#     while True:
#       if type(to) is GeneratorType:
#         stack.append(to)
#         to = next(to)
#         continue
#       stack.pop()
#       if not stack: break
#       to = stack[-1].send(to)
#     return to
#   return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*n
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    for i in range(n):
        print(ans[i])

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

from itertools import *
import bisect
from heapq import *
from math import *
from copy import *
from collections import deque
from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
from itertools import permutations as permutate
from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

from bisect import bisect_right as br
from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
from types import GeneratorType
def iterative(f, stack=[]):
  def wrapped_func(*args, **kwargs):
    if stack: return f(*args, **kwargs)
    to = f(*args, **kwargs)
    while True:
      if type(to) is GeneratorType:
        stack.append(to)
        to = next(to)
        continue
      stack.pop()
      if not stack: break
      to = stack[-1].send(to)
    return to
  return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = [-1]*(n+1)
    ind = 0
    ans = [0]*n
    for i in range(n):
        if(lastvis[c[i]] != -1):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    for i in range(n):
        print(ans[i])

testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    12th Sept , 2020  - Saturday
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

from itertools import *
import bisect
from heapq import *
from math import *
from copy import *
from collections import deque
from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
from itertools import permutations as permutate
from bisect import bisect_left as bl

#If the element is already present in the list,
# the left most position where element has to be inserted is returned.

from bisect import bisect_right as br
from bisect import bisect

#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
from types import GeneratorType
def iterative(f, stack=[]):
  def wrapped_func(*args, **kwargs):
    if stack: return f(*args, **kwargs)
    to = f(*args, **kwargs)
    while True:
      if type(to) is GeneratorType:
        stack.append(to)
        to = next(to)
        continue
      stack.pop()
      if not stack: break
      to = stack[-1].send(to)
    return to
  return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))
class BIT:
    def __init__(self,n):
        self.n = n
        self.tree = [0]*(n+1)

    def sum(self,x):
        sum = 0
        while(x>0):
            sum+=self.tree[x]
            x-=x&(-x)
        return sum

    def update(self,x,k):
        while(x<=self.n):
            self.tree[x]+=k
            x+=x&(-x)

    def build(self,a):
        for i in range(len(a)):
            k = a[i]
            x = i+1
            while(x<=self.n):
                self.tree[x]+=k
                x+=x&(-x)

def solve(case):
    n,q = sep()
    c = lis()
    query = []
    for i in range(q):
        l,r = sep()
        query.append((r,l,i))

    query = sorted(query)
    bit = BIT(n)
    lastvis = {}
    ind = 0
    ans = [0]*n
    for i in range(n):
        if(c[i] in lastvis):
            bit.update(lastvis[c[i]]+1,-1)

        lastvis[c[i]] = i
        bit.update(i+1,1)
        while(ind<q and query[ind][0] == i+1):
            ans[query[ind][2]] = (bit.sum(i+1) - bit.sum(query[ind][1]-1))
            ind+=1

    for i in range(n):
        print(ans[i])
        
testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
# Python3 code to find number of  
# distinct numbers in a subarray 
MAX = 1000001
  
# structure to store queries 
class Query: 
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__":
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries =[]
    for i in range(q):
        l,r = map(int,input().split())
        l-=1
        r-=1
        queries.append(Query(i,r,l))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q) 
  
# This code is contributed by 
# sanjeev2552 


Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    30th AUGUST , 2020  - SUNDAY
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

from itertools import *
import bisect
from heapq import *
from math import *
from copy import *
from collections import deque
from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
from itertools import permutations as permutate
from bisect import bisect_left as bl
#If the element is already present in the list,
# the left most position where element has to be inserted is returned.
from bisect import bisect_right as br
from bisect import bisect
#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
from types import GeneratorType
def iterative(f, stack=[]):
  def wrapped_func(*args, **kwargs):
    if stack: return f(*args, **kwargs)
    to = f(*args, **kwargs)
    while True:
      if type(to) is GeneratorType:
        stack.append(to)
        to = next(to)
        continue
      stack.pop()
      if not stack: break
      to = stack[-1].send(to)
    return to
  return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))

def solve(case):
    n,q = sep()
    c = lis()
    bsize = floor(n**0.5)
    blocks = [ceil(n/bsize)]
    query = []
    for i in range(q):
        l,r = sep()
        l-=1
        r-=1
        query.append((l//bsize,r,l,i))

    query = sorted(query)
    ans = [0]*(q)
    currl = 0
    currr = 0
    prev = 1
    have = {c[0]:1}
    # print(query)
    for i in range(q):
        l = query[i][2]
        r = query[i][1]
        # print(l,r)
        # print(currl,currr,prev)
        # print(have)

        while(currr<r):
            currr+=1
            if(c[currr] not in have):
                have[c[currr]] = 1
                prev+=1
            else:
                have[c[currr]] +=1
        while(currr>r):
            if(have[c[currr]]==1):
                prev-=1
                del have[c[currr]]
            else:
                have[c[currr]]-=1
            currr-=1

        while(currl>l):
            currl-=1
            if(c[currl] not in have):
                have[c[currl]] = 1
                prev+=1
            else:
                have[c[currl]] +=1
        while(currl<l):
            if(have[c[currl]] == 1):
                prev-=1
                del have[c[currl]]
            else:
                have[c[currl]]-=1
            currl+=1

        ans[query[i][3]]= prev

    for i in range(len(ans)):
        print(ans[i])



testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
"""
    Satwik_Tiwari ;) .
    30th AUGUST , 2020  - SUNDAY
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

from itertools import *
import bisect
from heapq import *
from math import *
from copy import *
from collections import deque
from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
from itertools import permutations as permutate
from bisect import bisect_left as bl
#If the element is already present in the list,
# the left most position where element has to be inserted is returned.
from bisect import bisect_right as br
from bisect import bisect
#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
from types import GeneratorType
def iterative(f, stack=[]):
  def wrapped_func(*args, **kwargs):
    if stack: return f(*args, **kwargs)
    to = f(*args, **kwargs)
    while True:
      if type(to) is GeneratorType:
        stack.append(to)
        to = next(to)
        continue
      stack.pop()
      if not stack: break
      to = stack[-1].send(to)
    return to
  return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))

def solve(case):
    n,q = sep()
    c = lis()
    bsize = floor(n**0.5)
    blocks = [ceil(n/bsize)]
    query = []
    for i in range(q):
        l,r = sep()
        l-=1
        r-=1
        query.append((l//bsize,r,l,i))

    query = sorted(query)
    ans = [0]*(q)
    currl = 0
    currr = 0
    prev = 1
    have = {c[0]:1}
    # print(query)
    for i in range(q):
        l = query[i][2]
        r = query[i][1]
        # print(l,r)
        # print(currl,currr,prev)
        # print(have)

        while(currr<r):
            currr+=1
            if(c[currr] not in have):
                have[c[currr]] = 1
                prev+=1
            else:
                have[c[currr]] +=1
        while(currr>r):
            if(have[c[currr]]==1):
                prev-=1
                del have[c[currr]]
            else:
                have[c[currr]]-=1
            currr-=1

        while(currl>l):
            currl-=1
            if(c[currl] not in have):
                have[c[currl]] = 1
                prev+=1
            else:
                have[c[currl]] +=1
        while(currl<l):
            if(have[c[currl]] == 1):
                prev-=1
                del have[c[currl]]
            else:
                have[c[currl]]-=1
            currl+=1

        ans[query[i][3]]= prev

    for i in range(len(ans)):
        print(ans[i])



testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Runtime Error):
"""
    Satwik_Tiwari ;) .
    30th AUGUST , 2020  - SUNDAY
"""

#===============================================================================================
#importing some useful libraries.
from __future__ import division, print_function

from fractions import Fraction
import sys
import os
from io import BytesIO, IOBase

from itertools import *
import bisect
from heapq import *
from math import *
from copy import *
from collections import deque
from collections import Counter as counter  # Counter(list)  return a dict with {key: count}
from itertools import combinations as comb # if a = [1,2,3] then print(list(comb(a,2))) -----> [(1, 2), (1, 3), (2, 3)]
from itertools import permutations as permutate
from bisect import bisect_left as bl
#If the element is already present in the list,
# the left most position where element has to be inserted is returned.
from bisect import bisect_right as br
from bisect import bisect
#If the element is already present in the list,
# the right most position where element has to be inserted is returned

#==============================================================================================
#fast I/O region
BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

# inp = lambda: sys.stdin.readline().rstrip("\r\n")

#===============================================================================================
### START ITERATE RECURSION ###
from types import GeneratorType
def iterative(f, stack=[]):
  def wrapped_func(*args, **kwargs):
    if stack: return f(*args, **kwargs)
    to = f(*args, **kwargs)
    while True:
      if type(to) is GeneratorType:
        stack.append(to)
        to = next(to)
        continue
      stack.pop()
      if not stack: break
      to = stack[-1].send(to)
    return to
  return wrapped_func
#### END ITERATE RECURSION ####

#===============================================================================================
#some shortcuts

mod = 1000000007
def inp(): return sys.stdin.readline().rstrip("\r\n") #for fast input
def out(var): sys.stdout.write(str(var))  #for fast output, always take string
def lis(): return list(map(int, inp().split()))
def stringlis(): return list(map(str, inp().split()))
def sep(): return map(int, inp().split())
def strsep(): return map(str, inp().split())
# def graph(vertex): return [[] for i in range(0,vertex+1)]
def zerolist(n): return [0]*n
def nextline(): out("\n")  #as stdout.write always print sring.
def testcase(t):
    for pp in range(t):
        solve(pp)
def printlist(a) :
    for p in range(0,len(a)):
        out(str(a[p]) + ' ')
def google(p):
    print('Case #'+str(p)+': ',end='')
def lcm(a,b): return (a*b)//gcd(a,b)
def power(x, y, p) :
    res = 1     # Initialize result
    x = x % p  # Update x if it is more , than or equal to p
    if (x == 0) :
        return 0
    while (y > 0) :
        if ((y & 1) == 1) : # If y is odd, multiply, x with result
            res = (res * x) % p

        y = y >> 1      # y = y/2
        x = (x * x) % p
    return res
def ncr(n,r): return factorial(n)//(factorial(r)*factorial(max(n-r,1)))
def isPrime(n) :
    if (n <= 1) : return False
    if (n <= 3) : return True
    if (n % 2 == 0 or n % 3 == 0) : return False
    i = 5
    while(i * i <= n) :
        if (n % i == 0 or n % (i + 2) == 0) :
            return False
        i = i + 6
    return True

#===============================================================================================
# code here ;))

def solve(case):
    n,q = sep()
    c = lis()
    bsize = floor(n**0.5)
    blocks = [ceil(n/bsize)]
    query = []
    for i in range(q):
        l,r = sep()
        l-=1
        r-=1
        query.append((l//bsize,r,l,i))

    query = sorted(query)
    ans = [0]*(q)
    currl = 0
    currr = 0
    prev = 1
    have = {c[0]:1}
    # print(query)
    for i in range(q):
        l = query[i][2]
        r = query[i][1]
        # print(l,r)
        # print(currl,currr,prev)
        while(currl>l):
            currl-=1
            if(c[currl] not in have):
                have[c[currl]] = 1
                prev+=1
            else:
                have[c[currl]] +=1
        while(currl<l):
            if(have[c[currl]] == 1):
                prev-=1
                del have[c[currl]]
            else:
                have[c[currl]]-=1
            currl+=1
        while(currr<r):
            currr+=1
            if(c[currr] not in have):
                have[c[currr]] = 1
                prev+=1
            else:
                have[c[currr]] +=1
        while(currr>r):
            if(have[c[currr]]==1):
                prev-=1
                del have[c[currr]]
            else:
                have[c[currr]]-=1
            currr-=1
        ans[query[i][3]]= prev

    for i in range(len(ans)):
        print(ans[i])



testcase(1)
# testcase(int(inp()))















Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)

Buggy python submission (verdict: Time Limit Exceeded):
MAX = 1000001

# structure to store queries
class Query:
    def __init__(self, l, r, idx):
        self.l = l
        self.r = r
        self.idx = idx

# updating the bit array
def update(idx, val, bit, n):
    while idx <= n:
        bit[idx] += val
        idx += idx & -idx

# querying the bit array
def query(idx, bit, n):
    summ = 0
    while idx:
        summ += bit[idx]
        idx -= idx & -idx
    return summ

def answeringQueries(arr, n, queries, q):

    # initialising bit array
    bit = [0] * (n + 1)

    # holds the rightmost index of
    # any number as numbers of a[i]
    # are less than or equal to 10^6
    last_visit = [-1] * MAX

    # answer for each query
    ans = [0] * q

    query_counter = 0
    for i in range(n):

        # If last visit is not -1 update -1 at the
        # idx equal to last_visit[arr[i]]
        if last_visit[arr[i]] != -1:
            update(last_visit[arr[i]] + 1, -1, bit, n)

        # Setting last_visit[arr[i]] as i and
        # updating the bit array accordingly
        last_visit[arr[i]] = i
        update(i + 1, 1, bit, n)

        # If i is equal to r of any query store answer
        # for that query in ans[]
        while query_counter < q and 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 += 1

    # print answer for each query
    for i in range(q):
        print(ans[i])

# Driver Code
if __name__ == "__main__":
    n,q= map(int,input().split())
    a = list(map(int,input().split()))

    # queries = [Query(0,2,0),
    #            Query(1,3,1),Query(2,2,2)]

    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        l-=1
        r-=1
        queries.append(Query(l,r,i))

    q = len(queries)

    queries.sort(key = lambda x: x.r)
    answeringQueries(a, n, queries, q)

# This code is contributed by
# sanjeev2552


Fixed submission:
MAX = 1000001

class Query:
    def __init__(self, l, r, idx): 
        self.l = l 
        self.r = r 
        self.idx = idx 
  
# updating the bit array 
def update(idx, val, bit, n): 
    while idx <= n: 
        bit[idx] += val 
        idx += idx & -idx 
  
# querying the bit array 
def query(idx, bit, n): 
    summ = 0
    while idx: 
        summ += bit[idx] 
        idx -= idx & -idx 
    return summ 
  
def answeringQueries(arr, n, queries, q): 
  
    # initialising bit array 
    bit = [0] * (n + 1) 
  
    # holds the rightmost index of  
    # any number as numbers of a[i] 
    # are less than or equal to 10^6 
    last_visit = [-1] * MAX
  
    # answer for each query 
    ans = [0] * q 
  
    query_counter = 0
    for i in range(n): 
  
        # If last visit is not -1 update -1 at the 
        # idx equal to last_visit[arr[i]] 
        if last_visit[arr[i]] != -1: 
            update(last_visit[arr[i]] + 1, -1, bit, n) 
  
        # Setting last_visit[arr[i]] as i and  
        # updating the bit array accordingly 
        last_visit[arr[i]] = i 
        update(i + 1, 1, bit, n) 
  
        # If i is equal to r of any query store answer 
        # for that query in ans[] 
        while query_counter < q and 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 += 1
  
    # print answer for each query 
    for i in range(q): 
        print(ans[i]) 
  
# Driver Code 
if __name__ == "__main__": 
    n,q = map(int,input().split())
    a = list(map(int,input().split()))
    # n = len(a)
    queries = []
    for i in range(q):
        l,r = map(int,input().split())
        queries.append(Query(l-1,r-1,i))
    # queries = [Query(0, 4, 0),
    #            Query(1, 3, 1),
    #            Query(2, 4, 2)]
    # q = len(queries)
  
    queries.sort(key = lambda x: x.r) 
    answeringQueries(a, n, queries, q)