Problem:
Score : 100 points

Problem Statement

You are given a binary array A=(A_1,A_2,\cdots,A_N) of length N.

Process Q queries of the following types. The i-th query is represented by three integers T_i,L_i,R_i.

T_i=1: Replace the value of A_j with 1-A_j for each L_i \leq j \leq R_i.

T_i=2: Calculate the inversion(*) of the array A_{L_i},A_{L_i+1},\cdots,A_{R_i}．

Note：The inversion of the array x_1,x_2,\cdots,x_k is the number of the pair of integers i,j with 1 \leq i < j \leq k, x_i > x_j.

Constraints

1 \leq N \leq 2 \times 10^5

0 \leq A_i \leq 1

1 \leq Q \leq 2 \times 10^5

1 \leq T_i \leq 2

1 \leq L_i \leq R_i \leq N

All values in Input are integer.

Input

Input is given from Standard Input in the following format:

N Q
A_1 A_2 \cdots A_N
T_1 L_1 R_1
T_2 L_2 R_2
\vdots
T_Q L_Q R_Q

Output

For each query with T_i=2, print the answer.

Sample Input 1

5 5
0 1 0 0 1
2 1 5
1 3 4
2 2 5
1 1 3
2 1 2

Sample Output 1

2
0
1

First query: Print 2, which is the inversion of (A_1,A_2,A_3,A_4,A_5)=(0,1,0,0,1).

Second query: Replace the value of A_3 and A_4 with 1 and 1, respectively.

Third query: Print 0, which is the inversion of (A_2,A_3,A_4,A_5)=(1,1,1,1).

Fourth query: Replace the value of A_1, A_2 and A_4 with 1, 0 and 0, respectively.

Fifth query: Print 1, which is the inversion of (A_1,A_2)=(1,0).

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

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Reflection.Metadata;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;

namespace AtCoder
{
	public class Program
	{
		static void Main()
		{
			using var cin = new Scanner();
			var (n, q) = cin.Int2();
			var a = new (long zero, long one, long ans)[n];
			for (int i = 0; i < n; i++) {
				int aa = cin.Int();
				if (aa == 0) {
					a[i] = (1, 0, 0);
				} else {
					a[i] = (0, 1, 0);
				}
			}

			var seg = new LazySegmentTree<(long zero, long one, long ans), bool>(
				a,
				(0, 0, 0),
				false,
				(x, y) => (x.zero + y.zero, x.one + y.one, x.ans + y.ans + x.one * y.zero),
				(x, y, n) => y ? (x.one, x.zero, x.one * x.zero - x.ans) : x,
				(x, y) => (x && !y) || (!x && y));
			for (int i = 0; i < q; i++) {
				int t = cin.Int();
				int l = cin.Int() - 1;
				int r = cin.Int();
				if (t == 1) {
					seg.Update(l, r, true);
				} else {
					Console.WriteLine(seg.Query(l, r).ans);
				}
			}
		}
	}

	public class LazySegmentTree<TData, TUpdate> : IEnumerable<TData>
	{
		private readonly int n_;
		private readonly TData[] data_;
		private readonly TUpdate[] lazy_;
		private readonly Func<TData, TData, TData> operate_;
		private readonly Func<TData, TUpdate, int, TData> update_;
		private readonly Func<TUpdate, TUpdate, TUpdate> compose_;
		private readonly TData unitData_;
		private readonly TUpdate unitUpdate_;

		public int Count { get; }

		public TData this[int index] => Query(index);

		public LazySegmentTree(
			int count,
			TData unitData,
			TUpdate unitUpdate,
			Func<TData, TData, TData> operate,
			Func<TData, TUpdate, int, TData> update,
			Func<TUpdate, TUpdate, TUpdate> compose)
		{
			Count = count;
			n_ = 1;
			while (n_ < count) {
				n_ <<= 1;
			}

			data_ = new TData[n_ << 1];
			for (int i = 0; i < data_.Length; i++) {
				data_[i] = unitData;
			}

			lazy_ = new TUpdate[n_ << 1];
			for (int i = 0; i < lazy_.Length; i++) {
				lazy_[i] = unitUpdate;
			}

			unitData_ = unitData;
			unitUpdate_ = unitUpdate;
			operate_ = operate;
			update_ = update;
			compose_ = compose;
		}

		public LazySegmentTree(
			IReadOnlyList<TData> src,
			TData unitData,
			TUpdate unitUpdate,
			Func<TData, TData, TData> operate,
			Func<TData, TUpdate, int, TData> update,
			Func<TUpdate, TUpdate, TUpdate> compose)
			: this(src.Count, unitData, unitUpdate, operate, update, compose)
		{
			for (int i = 0; i < src.Count; i++) {
				data_[i + n_] = src[i];
			}

			for (int i = n_ - 1; i > 0; --i) {
				data_[i] = operate_(data_[i << 1], data_[(i << 1) + 1]);
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public void Update(int v, TUpdate value)
			=> Update(v, v + 1, value);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public void Update(Range range, TUpdate value)
			=> Update(range.Start.Value, range.End.Value, value);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public void Update(int left, int right, TUpdate value)
			=> UpdateCore(left, right, 1, 0, n_, value);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private void UpdateCore(int left, int right, int v, int l, int r, TUpdate value)
		{
			if (left <= l && r <= right) {
				Propagate(v, l, r, value);
			} else if (left < r && l < right) {
				int lc = v << 1;
				int rc = (v << 1) + 1;
				int mid = (l + r) >> 1;
				Propagate(lc, l, mid, v);
				UpdateCore(left, right, lc, l, mid, value);
				Propagate(rc, mid, r, v);
				UpdateCore(left, right, rc, mid, r, value);
				data_[v] = operate_(data_[lc], data_[rc]);
				lazy_[v] = unitUpdate_;
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public TData Query(int v) => Query(v, v + 1);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public TData Query(Range range) => Query(range.Start.Value, range.End.Value);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public TData Query(int left, int right)
			=> QueryCore(left, right, 1, 0, n_);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private TData QueryCore(int left, int right, int v, int l, int r)
		{
			if (left <= l && r <= right) {
				return data_[v];
			} else if (r <= left || right <= l) {
				return unitData_;
			} else {
				int lc = v << 1;
				int rc = (v << 1) + 1;
				int mid = (l + r) >> 1;
				Propagate(lc, l, mid, v);
				Propagate(rc, mid, r, v);
				lazy_[v] = unitUpdate_;
				return operate_(
					QueryCore(left, right, lc, l, mid),
					QueryCore(left, right, rc, mid, r)
				);
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int FindLeftest(Range range, Func<TData, bool> check)
			=> FindLeftest(range.Start.Value, range.End.Value, check);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int FindLeftest(int left, int right, Func<TData, bool> check)
			=> FindLeftestCore(left, right, 1, 0, n_, check);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private int FindLeftestCore(int left, int right, int v, int l, int r, Func<TData, bool> check)
		{
			if (check(data_[v]) == false || r <= left || right <= l) {
				return right;
			} else if (v >= n_) {
				return v - n_;
			} else {
				int lc = v << 1;
				int rc = (v << 1) + 1;
				int mid = (l + r) >> 1;
				Propagate(lc, l, mid, v);
				Propagate(rc, mid, r, v);
				lazy_[v] = unitUpdate_;

				int vl = FindLeftestCore(left, right, lc, l, mid, check);
				if (vl != right) {
					return vl;
				} else {
					return FindLeftestCore(left, right, rc, mid, r, check);
				}
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int FindRightest(Range range, Func<TData, bool> check)
			=> FindRightest(range.Start.Value, range.End.Value, check);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int FindRightest(int left, int right, Func<TData, bool> check)
			=> FindRightestCore(left, right, 1, 0, n_, check);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private int FindRightestCore(int left, int right, int v, int l, int r, Func<TData, bool> check)
		{
			if (check(data_[v]) == false || r <= left || right <= l) {
				return left - 1;
			} else if (v >= n_) {
				return v - n_;
			} else {
				int lc = v << 1;
				int rc = (v << 1) + 1;
				int mid = (l + r) >> 1;
				Propagate(lc, l, mid, v);
				Propagate(rc, mid, r, v);
				lazy_[v] = unitUpdate_;

				int vr = FindRightestCore(left, right, rc, mid, r, check);
				if (vr != left - 1) {
					return vr;
				} else {
					return FindRightestCore(left, right, lc, l, mid, check);
				}
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private void Propagate(int v, int l, int r, int p)
			=> Propagate(v, l, r, lazy_[p]);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		private void Propagate(int v, int l, int r, TUpdate value)
		{
			data_[v] = update_(data_[v], value, r - l);
			lazy_[v] = compose_(lazy_[v], value);
		}

		public IEnumerator<TData> GetEnumerator()
		{
			for (int i = 0; i < Count; i++) {
				yield return this[i];
			}
		}

		IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
	};

	public class HashMap<TKey, TValue> : Dictionary<TKey, TValue>
	{
		private readonly Func<TKey, TValue> initialzier_;
		public HashMap(Func<TKey, TValue> initialzier)
			: base()
		{
			initialzier_ = initialzier;
		}

		public HashMap(Func<TKey, TValue> initialzier, int capacity)
			: base(capacity)
		{
			initialzier_ = initialzier;
		}

		new public TValue this[TKey key]
		{
			get
			{
				if (ContainsKey(key) == false) {
					base[key] = initialzier_(key);
				}

				return base[key];
			}

			set { base[key] = value; }
		}
	}

	public struct ModInt
	{
		public const long P = 1000000007;
		//public const long P = 998244353;

		public static ModInt Inverse(ModInt value) => Pow(value, P - 2);
		public static ModInt Pow(ModInt value, long k) => Pow(value.value_, k);
		public static ModInt Pow(long value, long k)
		{
			long ret = 1;
			for (k %= P - 1; k > 0; k >>= 1, value = value * value % P) {
				if ((k & 1) == 1) {
					ret = ret * value % P;
				}
			}
			return new ModInt(ret);
		}

		private long value_;

		public ModInt(long value)
			=> value_ = value;
		public ModInt(long value, bool mods)
		{
			if (mods) {
				value %= P;
				if (value < 0) {
					value += P;
				}
			}

			value_ = value;
		}

		public static ModInt operator +(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = (lhs.value_ + rhs.value_) % P;
			return lhs;
		}
		public static ModInt operator +(long lhs, ModInt rhs)
		{
			rhs.value_ = (lhs + rhs.value_) % P;
			return rhs;
		}
		public static ModInt operator +(ModInt lhs, long rhs)
		{
			lhs.value_ = (lhs.value_ + rhs) % P;
			return lhs;
		}

		public static ModInt operator -(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = (P + lhs.value_ - rhs.value_) % P;
			return lhs;
		}
		public static ModInt operator -(long lhs, ModInt rhs)
		{
			rhs.value_ = (P + lhs - rhs.value_) % P;
			return rhs;
		}
		public static ModInt operator -(ModInt lhs, long rhs)
		{
			lhs.value_ = (P + lhs.value_ - rhs) % P;
			return lhs;
		}

		public static ModInt operator *(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = lhs.value_ * rhs.value_ % P;
			return lhs;
		}
		public static ModInt operator *(long lhs, ModInt rhs)
		{
			rhs.value_ = lhs * rhs.value_ % P;
			return rhs;
		}
		public static ModInt operator *(ModInt lhs, long rhs)
		{
			lhs.value_ = lhs.value_ * rhs % P;
			return lhs;
		}

		public static ModInt operator /(ModInt lhs, ModInt rhs)
		{
			long exp = P - 2;
			while (exp > 0) {
				if (exp % 2 > 0) {
					lhs *= rhs;
				}

				rhs *= rhs;
				exp /= 2;
			}

			return lhs;
		}

		public static implicit operator ModInt(long n) => new ModInt(n, true);
		public long ToLong() => value_;
		public override string ToString() => value_.ToString();
	}

	public static class Helper
	{
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void UpdateMin<T>(ref T target, T value) where T : IComparable<T>
			=> target = target.CompareTo(value) > 0 ? value : target;
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void UpdateMin<T>(ref T target, T value, Action<T> onUpdated) where T : IComparable<T>
		{
			if (target.CompareTo(value) > 0) {
				target = value;
				onUpdated(value);
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void UpdateMax<T>(ref T target, T value) where T : IComparable<T>
			=> target = target.CompareTo(value) < 0 ? value : target;
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void UpdateMax<T>(ref T target, T value, Action<T> onUpdated) where T : IComparable<T>
		{
			if (target.CompareTo(value) < 0) {
				target = value;
				onUpdated(value);
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static T[] Array<T>(int n, Func<int, T> init)
			=> Enumerable.Range(0, n).Select(x => init(x)).ToArray();
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static List<T> List<T>(int n, Func<int, T> init)
			=> Enumerable.Range(0, n).Select(x => init(x)).ToList();

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static T[,] Array2<T>(int n, int m, T init)
			where T : struct
		{
			var array = new T[n, m];
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					array[i, j] = init;
				}
			}

			return array;
		}
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static T[,] Array2<T>(int n, int m, Func<int, int, T> initializer)
		{
			var array = new T[n, m];
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					array[i, j] = initializer(i, j);
				}
			}

			return array;
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static T[,,] Array3<T>(int n1, int n2, int n3, T init)
			where T : struct
		{
			var array = new T[n1, n2, n3];
			for (int i1 = 0; i1 < n1; i1++) {
				for (int i2 = 0; i2 < n2; i2++) {
					for (int i3 = 0; i3 < n3; i3++) {
						array[i1, i2, i3] = init;
					}
				}
			}

			return array;
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static T[,,,] Array4<T>(int n1, int n2, int n3, int n4, T init)
			where T : struct
		{
			var array = new T[n1, n2, n3, n4];
			for (int i1 = 0; i1 < n1; i1++) {
				for (int i2 = 0; i2 < n2; i2++) {
					for (int i3 = 0; i3 < n3; i3++) {
						for (int i4 = 0; i4 < n4; i4++) {
							array[i1, i2, i3, i4] = init;
						}
					}
				}
			}

			return array;
		}

		private static readonly int[] delta4_ = { 1, 0, -1, 0, 1 };
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void DoAt4(int i, int j, int imax, int jmax, Action<int, int> action)
		{
			for (int dn = 0; dn < 4; dn++) {
				int d4i = i + delta4_[dn];
				int d4j = j + delta4_[dn + 1];
				if ((uint)d4i < (uint)imax && (uint)d4j < (uint)jmax) {
					action(d4i, d4j);
				}
			}
		}

		private static readonly int[] delta8_ = { 1, 0, -1, 0, 1, 1, -1, -1, 1 };
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void DoAt8(int i, int j, int imax, int jmax, Action<int, int> action)
		{
			for (int dn = 0; dn < 8; dn++) {
				int d8i = i + delta8_[dn];
				int d8j = j + delta8_[dn + 1];
				if ((uint)d8i < (uint)imax && (uint)d8j < (uint)jmax) {
					action(d8i, d8j);
				}
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void ForEachSubBit(int bit, Action<int> action)
		{
			for (int sub = bit; sub >= 0; sub--) {
				sub &= bit;
				action(sub);
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static string Reverse(string src)
		{
			var chars = src.ToCharArray();
			for (int i = 0, j = chars.Length - 1; i < j; i++, j--) {
				var tmp = chars[i];
				chars[i] = chars[j];
				chars[j] = tmp;
			}
			return new string(chars);
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static string Join<T>(this IEnumerable<T> values, string separator = "")
			=> string.Join(separator, values);
	}

	public class Scanner : IDisposable
	{
		private const int BUFFER_SIZE = 1024;
		private const int ASCII_CHAR_BEGIN = 33;
		private const int ASCII_CHAR_END = 126;
		private readonly string filePath_;
		private readonly Stream stream_;
		private readonly byte[] buf_ = new byte[BUFFER_SIZE];
		private int length_ = 0;
		private int index_ = 0;
		private bool isEof_ = false;

		public Scanner(string file = "")
		{
			if (string.IsNullOrWhiteSpace(file)) {
				stream_ = Console.OpenStandardInput();
			} else {
				filePath_ = file;
				stream_ = new FileStream(file, FileMode.Open);
			}

			Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) {
				AutoFlush = false
			});
		}

		public void Dispose()
		{
			Console.Out.Flush();
			stream_.Dispose();
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public char Char()
		{
			byte b;
			do {
				b = Read();
			} while (b < ASCII_CHAR_BEGIN || ASCII_CHAR_END < b);

			return (char)b;
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public string Next()
		{
			var sb = new StringBuilder();
			for (var b = Char(); b >= ASCII_CHAR_BEGIN && b <= ASCII_CHAR_END; b = (char)Read()) {
				sb.Append(b);
			}

			return sb.ToString();
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int Int() => (int)Long();
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int Int(int offset) => Int() + offset;
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (int, int) Int2(int offset = 0)
			=> (Int(offset), Int(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (int, int, int) Int3(int offset = 0)
			=> (Int(offset), Int(offset), Int(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (int, int, int, int) Int4(int offset = 0)
			=> (Int(offset), Int(offset), Int(offset), Int(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public int[] ArrayInt(int length, int offset = 0)
		{
			int[] Array = new int[length];
			for (int i = 0; i < length; i++) {
				Array[i] = Int(offset);
			}
			return Array;
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public long Long()
		{
			long ret = 0;
			byte b;
			bool 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';
				}
			}
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public long Long(long offset) => Long() + offset;
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (long, long) Long2(long offset = 0)
			=> (Long(offset), Long(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (long, long, long) Long3(long offset = 0)
			=> (Long(offset), Long(offset), Long(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (long, long, long, long) Long4(long offset = 0)
			=> (Long(offset), Long(offset), Long(offset), Long(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public long[] ArrayLong(int length, long offset = 0)
		{
			long[] Array = new long[length];
			for (int i = 0; i < length; i++) {
				Array[i] = Long(offset);
			}
			return Array;
		}

		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public double Double() => double.Parse(Next(), CultureInfo.InvariantCulture);
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public double Double(double offset) => Double() + offset;
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (double, double) Double2(double offset = 0)
			=> (Double(offset), Double(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (double, double, double) Double3(double offset = 0)
			=> (Double(offset), Double(offset), Double(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public (double, double, double, double) Double4(double offset = 0)
			=> (Double(offset), Double(offset), Double(offset), Double(offset));
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public double[] ArrayDouble(int length, double offset = 0)
		{
			double[] Array = new double[length];
			for (int i = 0; i < length; i++) {
				Array[i] = Double(offset);
			}
			return Array;
		}

		private byte Read()
		{
			if (isEof_) {
				throw new EndOfStreamException();
			}

			if (index_ >= length_) {
				index_ = 0;
				if ((length_ = stream_.Read(buf_, 0, BUFFER_SIZE)) <= 0) {
					isEof_ = true;
					return 0;
				}
			}

			return buf_[index_++];
		}

		public void Save(string text)
		{
			if (string.IsNullOrWhiteSpace(filePath_)) {
				return;
			}

			File.WriteAllText(filePath_ + "_output.txt", text);
		}
	}
}