Problem:
Score : 600 points

Problem Statement

We have N colored balls arranged in a row from left to right; the color of the i-th ball from the left is c_i.

You are given Q queries. The i-th query is as follows: how many different colors do the l_i-th through r_i-th balls from the left have?

Constraints

1\leq N,Q \leq 5 \times 10^5

1\leq c_i \leq N

1\leq l_i \leq r_i \leq N

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N Q
c_1 c_2 \cdots c_N
l_1 r_1
l_2 r_2
:
l_Q r_Q

Output

Print Q lines. The i-th line should contain the response to the i-th query.

Sample Input 1

4 3
1 2 1 3
1 3
2 4
3 3

Sample Output 1

2
3
1

The 1-st, 2-nd, and 3-rd balls from the left have the colors 1, 2, and 1 - two different colors.

The 2-st, 3-rd, and 4-th balls from the left have the colors 2, 1, and 3 - three different colors.

The 3-rd ball from the left has the color 1 - just one color.

Sample Input 2

10 10
2 5 6 5 2 1 7 9 7 2
5 5
2 4
6 7
2 2
7 8
7 9
1 8
6 9
8 10
6 8

Sample Output 2

1
2
2
1
2
2
6
3
3
3

Solution in C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;

namespace AtCoder
{
    class Program
    {
        private static void Main(string[] args)
        {
            var n = Scanner.ArrayInt(2);
            var balls = Scanner.ScanIncludeSpace();
            var queries = new List<List<int>>();
            for (int i = 0; i < n[1]; i++)
            {
                queries.Add(Scanner.ArrayInt(2));
            }

            OutAllLine(queries
                .Select(q => balls.Skip((q[0] - 1) * 2).Take((q[1] - q[0] + 1) * 2).Distinct().Count() - 1)
                .ToArray());
        }
        
        #region Utility
        static readonly StreamScanner Scanner = new StreamScanner(Console.OpenStandardInput());

        /// <summary> 一括出力 </summary>
        private static void OutAllLine(IEnumerable<int> items)
        {
            var sb = new StringBuilder();
            foreach (var result in items)
            {
                sb.Append(result.ToString() + "\n");
            }
            sb = sb.Remove(sb.Length - 1, 1);
            Console.WriteLine(sb);
        }
        #endregion
    }

    #region Utility Class
    public class StreamScanner
    {
        public StreamScanner(Stream stream) { str = stream; }
        private readonly Stream str;
        private readonly byte[] buf = new byte[1024];
        private int len, ptr;
        public bool isEof = false;
        public bool IsEndOfStream { get { return isEof; } }
        private byte read()
        {
            if (isEof) throw new EndOfStreamException();
            if (ptr >= len) {
                ptr = 0;
                if ((len = str.Read(buf, 0, 1024)) <= 0)
                {
                    isEof = true;
                    return 0;
                }
            }
            return buf[ptr++];
        }
        public char Char() 
        {
            byte b = 0;
            do b = read();
            while (b < 33 || 126 < b);
            return (char)b; 
        }
        public string Scan()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 33 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public string ScanIncludeSpace()
        {
            var sb = new StringBuilder();
            for (var b = Char(); b >= 32 && b <= 126; b = (char)read())
                sb.Append(b);
            return sb.ToString();
        }
        public long Long()
        {
            long ret = 0; byte b = 0; var ng = false;
            do b = read();
            while (b != '-' && (b < '0' || '9' < b));
            if (b == '-') { ng = true; b = read(); }
            for (; true; b = read())
            {
                if (b < '0' || '9' < b)
                    return ng ? -ret : ret;
                else ret = ret * 10 + b - '0';
            }
        }
        public int Integer() { return (int)Long(); }
        public double Double() { return double.Parse(Scan(), CultureInfo.InvariantCulture); }
        
        /// <summary> 数値読み込み </summary>
        public List<long> ArrayLong(int count = 0)
        {
            var scan = new List<long>();
            for (int i = 0; i < count; i++)
            {
                scan.Add(Long());
            }
            return scan;
        }
        /// <summary> 数値読み込み </summary>
        public List<int> ArrayInt(int count = 0)
        {
            var scan = new List<int>();
            for (int i = 0; i < count; i++)
            {
                scan.Add(Integer());
            }
            return scan;
        }
    }
    public class Primer
    {
        /// <summary> 素数判定 </summary>
        public static bool IsPrime(int num)
        {
            if (num < 2) {return false;}
            if (num == 2) {return true;}
            if (num % 2 == 0) {return false;}

            double sqrtNum = Math.Sqrt(num);
            for (int i = 3; i <= sqrtNum; i += 2)
            {
                if (num % i == 0) { return false; }
            }
            return true;
        }

        public static IEnumerable<int> GetPrimeFactors(int n)
        {
            int i = 2;
            int tmp = n;

            while (i * i <= n) //※1
            {
                if(tmp % i == 0){
                    tmp /= i;
                    yield return i;
                }else{
                    i++;
                }
            }
            if(tmp != 1) yield return tmp;
        }
    }
    public class Mod109
    {
        public const int _7 = 1000000007;
        public const int _9 = 1000000009;
        public const int _3 = 998244353;
        
        private readonly int ModValue;

        public Mod109(int modValue = Mod109._7)
        {
            ModValue = modValue;
        }
        
        /// <summary> 和 </summary>
        public long Addition(IEnumerable<long> nums)
        {
            return nums.Aggregate<long, long>(0, (current, num) => ModifyPositive((current + num) % ModValue));
        }
        
        /// <summary> 差 </summary>
        public long Subtraction(IEnumerable<long> nums)
        {
            return nums.Aggregate<long, long>(0, (current, num) => ModifyPositive((current - num) % ModValue));
        }
        
        /// <summary> 積 </summary>
        public long Multiplication(IEnumerable<long> nums)
        {
            return nums.Aggregate<long, long>(1, (current, num) => ModifyPositive((current * num) % ModValue));
        }

        private long ModifyPositive(long value)
        {
            return value < 0 ? (value + ModValue) : value;
        }
    }
    public class BitArrayMaker
    {
        public List<int> Integer(int bitValue, int length)
        {
            var list = new List<int>();
            for (int i = 0; i < length; i++)
            {
                if (bitValue % 2 == 1)
                {
                    list.Add(i);
                }
                bitValue /= 2;
            }
            return list;
        }
        
        public bool[] Boolean(int bitValue, int length)
        {
            var list = new bool[length];
            for (int i = 0; i < length; i++)
            {
                list[i] = bitValue % 2 == 1;
                bitValue /= 2;
            }
            return list;
        }
    }
    #endregion
    
}