結果
| 問題 | No.1300 Sum of Inversions |
| ユーザー |
 kichi2004_
|
| 提出日時 | 2020-11-27 22:18:33 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 28,511 bytes |
| コンパイル時間 | 1,461 ms |
| コンパイル使用メモリ | 129,192 KB |
| 実行使用メモリ | 69,864 KB |
| 最終ジャッジ日時 | 2024-07-26 13:18:57 |
| 合計ジャッジ時間 | 22,134 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge5 |
（要ログイン）
テストケース
テストケース表示| 入力 | 結果 | 実行時間 実行使用メモリ |
|---|---|---|
| testcase_00 | AC | 42 ms
26,232 KB |
| testcase_01 | AC | 41 ms
26,104 KB |
| testcase_02 | AC | 43 ms
28,248 KB |
| testcase_03 | WA | - |
| testcase_04 | WA | - |
| testcase_05 | WA | - |
| testcase_06 | WA | - |
| testcase_07 | WA | - |
| testcase_08 | WA | - |
| testcase_09 | WA | - |
| testcase_10 | WA | - |
| testcase_11 | WA | - |
| testcase_12 | WA | - |
| testcase_13 | WA | - |
| testcase_14 | WA | - |
| testcase_15 | WA | - |
| testcase_16 | WA | - |
| testcase_17 | WA | - |
| testcase_18 | WA | - |
| testcase_19 | WA | - |
| testcase_20 | WA | - |
| testcase_21 | WA | - |
| testcase_22 | WA | - |
| testcase_23 | WA | - |
| testcase_24 | WA | - |
| testcase_25 | WA | - |
| testcase_26 | WA | - |
| testcase_27 | WA | - |
| testcase_28 | WA | - |
| testcase_29 | WA | - |
| testcase_30 | WA | - |
| testcase_31 | WA | - |
| testcase_32 | WA | - |
| testcase_33 | AC | 580 ms
62,816 KB |
| testcase_34 | AC | 613 ms
64,140 KB |
| testcase_35 | WA | - |
| testcase_36 | WA | - |
コンパイルメッセージ
Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc) Copyright (C) Microsoft Corporation. All rights reserved.
ソースコード
// ReSharper disable RedundantUsingDirective
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.IO;
using System.Linq;
using System.Numerics;
using static Solve.Methods;
using static Solve.Input;
using static Solve.Output;
using static System.Math;
// Resharper restore RedundantUsingDirective
using Solve.Libraries.ModInt;
using Solve.Libraries.SegmentTree.SegmentTree;
namespace Solve
{
public partial class Solver {
public void Main() {
int N = Int;
var A = Long.array(N);
var memo = A.Select((x, i) => (x, i)).ToArray().Sort();
var conv = new int[N];
for (int i = 0; i < N; i++) {
conv[memo[i].i] = i;
}
var seg = new SegmentTree<(ModInt sum, int cnt)>(
N,
(a, b) => (a.sum + b.sum, a.cnt + b.cnt),
(0, 0)
);
seg.Build();
var B = new (ModInt, int)[N];
for (int i = 0; i < N; i++) {
var idx = conv[i];
seg.Update(idx, (A[i], 1));
var (val, cnt) = seg.Query(idx + 1, N);
B[i] = (val + A[i] * cnt, cnt);
}
var seg2 = new SegmentTree<(ModInt sum, int cnt)>(
N,
(a, b) => (a.sum + b.sum, a.cnt + b.cnt),
(0, 0)
);
var C = new ModInt[N];
for (int i = 0; i < N; i++) {
var idx = conv[i];
seg2.Update(idx, B[i]);
var (val, cnt) = seg2.Query(idx + 1, N);
C[i] = val + A[i] * cnt;
}
var ans = ModInt.Zero;
foreach (var l in C) {
ans += l;
}
print(ans);
}
public const int MOD = 1000000007;
}
public static class Methods
{
[MethodImpl(256)] public static bool Assert(in bool b, in string message = null) =>
b ? true : throw new Exception(message ?? "Assert failed.");
[MethodImpl(256)] public static string JoinSpace<T>(this IEnumerable<T> source) => source.Join(" ");
[MethodImpl(256)] public static string JoinEndline<T>(this IEnumerable<T> source) => source.Join("\n");
[MethodImpl(256)] public static string Join<T>(this IEnumerable<T> source, string s) => string.Join(s, source);
[MethodImpl(256)] public static string Join<T>(this IEnumerable<T> source, char c) =>
string.Join(c.ToString(), source);
public static int Gcd(int a, int b) => (int) Gcd((long) a, b);
public static long Gcd(long a, long b) {
while (true) {
if (a < b) (a, b) = (b, a);
if (a % b == 0) return b;
(a, b) = (b, a % b);
}
}
public static long Lcm(long a, long b) => a / Gcd(a, b) * b;
public static bool IsPrime(long value) {
if (value <= 1) return false;
for (long i = 2; i * i <= value; ++i) if (value % i == 0) return false;
return true;
}
public static long Pow(long a, int b) {
long res = 1;
while (b > 0) { if (b % 2 != 0) res *= a; a *= a; b >>= 1; }
return res;
}
public static int PowMod(long a, long b, int p) => (int) PowMod(a, b, (long) p);
public static long PowMod(long a, long b, long p) {
long res = 1;
while (b > 0) { if (b % 2 != 0) res = res * a % p; a = a * a % p; b >>= 1; }
return res;
}
public static IEnumerable<long> Factors(long n) {
Assert(n >= 0, "n must be greater than 0.");
for (long i = 1; i * i <= n; ++i) {
var div = DivRem(n, i, out var rem);
if (rem > 0) continue;
yield return div;
if (i != div) yield return i;
}
}
public static IEnumerable<int> Factors(int n) => Factors((long) n).Select(Convert.ToInt32);
[MethodImpl(256)] public static int DivCeil(int a, int b) => (a + b - 1) / b;
[MethodImpl(256)] public static long DivCeil(long a, long b) => (a + b - 1) / b;
public static IEnumerable<T[]> Permutations<T>(IEnumerable<T> src) {
var ret = new List<T[]>();
Search(ret, new Stack<T>(), src.ToArray());
return ret;
static void Search(ICollection<T[]> perms, Stack<T> stack, T[] a) {
int N = a.Length;
if (N == 0) perms.Add(stack.Reverse().ToArray());
else {
var b = new T[N - 1];
Array.Copy(a, 1, b, 0, N - 1);
for (int i = 0; i < a.Length; ++i) {
stack.Push(a[i]);
Search(perms, stack, b);
if (i < b.Length) b[i] = a[i];
stack.Pop();
}
}
}
}
public static long BinarySearch(long low, long high, Func<long, bool> expression) {
while (low < high) {
long middle = (high - low) / 2 + low;
if (!expression(middle))
high = middle;
else
low = middle + 1;
}
return high;
}
public static int LowerBound<T>(T[] arr, int start, int end, T value, IComparer<T> comparer) {
int low = start;
int high = end;
while (low < high) {
var mid = ((high - low) >> 1) + low;
if (comparer.Compare(arr[mid], value) < 0)
low = mid + 1;
else
high = mid;
}
return low;
}
public static int LowerBound<T>(T[] arr, T value) where T : IComparable =>
LowerBound(arr, 0, arr.Length, value, Comparer<T>.Default);
public static int UpperBound<T>(T[] arr, int start, int end, T value, IComparer<T> comparer) {
var (low, high) = (start, end);
while (low < high) {
var mid = ((high - low) >> 1) + low;
if (comparer.Compare(arr[mid], value) <= 0) low = mid + 1;
else high = mid;
}
return low;
}
public static int UpperBound<T>(T[] arr, T value) =>
UpperBound(arr, 0, arr.Length, value, Comparer<T>.Default);
[MethodImpl(256)]
public static IEnumerable<TResult> Repeat<TResult>(TResult value, int count) => Enumerable.Repeat(value, count);
[MethodImpl(256)] public static string AsString(this IEnumerable<char> source) => new string(source.ToArray());
public static IEnumerable<long> CumSum(this IEnumerable<long> source) {
long sum = 0; foreach (var item in source) yield return sum += item;
}
public static IEnumerable<int> CumSum(this IEnumerable<int> source) {
int sum = 0; foreach (var item in source) yield return sum += item;
}
[MethodImpl(256)] public static bool IsIn<T>(this T value, T l, T r) where T : IComparable<T> =>
l.CompareTo(r) > 0 ? throw new ArgumentException() : l.CompareTo(value) <= 0 && value.CompareTo(r) < 0;
[MethodImpl(256)] public static bool IsIn(this in int value, in Range range) =>
value.IsIn(range.Start.Value, range.End.Value);
[MethodImpl(256)] public static bool IsIn(this in Index value, in Range range) =>
value.IsFromEnd && value.Value.IsIn(range.Start.Value, range.End.Value);
public static IEnumerable<int> Range(int start, int end, int step = 1) {
for (var i = start; i < end; i += step) yield return i;
}
public static IEnumerable<int> Range(int end) => Range(0, end);
public static IEnumerable<int> Range(Range range, int step = 1) =>
Range(range.Start.Value, range.End.Value, step);
[MethodImpl(256)] public static T[] Sort<T>(this T[] arr) where T : IComparable<T> {
var array = arr[..]; Array.Sort(array); return array;
}
[MethodImpl(256)]
public static T[] Sort<T, U>(this T[] arr, Func<T, U> selector) where U : IComparable<U> {
var array = arr[..];
Array.Sort(array, (a, b) => selector(a).CompareTo(selector(b)));
return array;
}
[MethodImpl(256)] public static T[] SortDescending<T>(this T[] arr) where T : IComparable<T> {
var array = arr[..];
Array.Sort(array, (a, b) => b.CompareTo(a));
return array;
}
[MethodImpl(256)]
public static T[] SortDescending<T, U>(this T[] arr, Func<T, U> selector) where U : IComparable<U> {
var array = arr[..];
Array.Sort(array, (a, b) => selector(b).CompareTo(selector(a)));
return array;
}
public static T[] Unique<T>(this IEnumerable<T> arr) {
var source = arr.ToArray();
var ret = new List<T>(source.Length);
var set = new SortedSet<T>();
ret.AddRange(source.Where(val => set.Add(val)));
return ret.ToArray();
}
[MethodImpl(256)] public static bool chmin<T>(ref T a, T b)
where T : IComparable<T> {
if (a.CompareTo(b) > 0) { a = b; return true; }
return false;
}
[MethodImpl(256)] public static bool chmax<T>(ref T a, T b)
where T : IComparable<T> {
if (a.CompareTo(b) < 0) { a = b; return true; }
return false;
}
public static T[] InitArray<T>(int n, Func<int, T> init) {
var res = new T[n];
for (int i = 0; i < n; i++) res[i] = init(i);
return res;
}
public static T[][] JaggedArray2D<T>(int a, int b, T defaultValue = default) {
var ret = new T[a][];
for (int i = 0; i < a; ++i) ret[i] = Enumerable.Repeat(defaultValue, b).ToArray();
return ret;
}
public static T[,] Array2D<T>(int a, int b, T defaultValue = default) {
var ret = new T[a, b];
for (int i = 0; i < a; ++i) for (int j = 0; j < b; ++j) ret[i, j] = defaultValue;
return ret;
}
public static T[,] To2DArray<T>(this T[][] array) {
if (!array.Any()) return new T[0, 0];
int len = array[0].Length;
if (array.Any(x => x.Length != len))
throw new ArgumentException("Length of each array must be same.", nameof(array));
var ret = new T[array.Length, len];
for (int i = 0; i < array.Length; ++i) for (int j = 0; j < len; ++j) ret[i, j] = array[i][j];
return ret;
}
[MethodImpl(256)] public static T Min<T>(params T[] col) => col.Min();
[MethodImpl(256)] public static T Max<T>(params T[] col) => col.Max();
[MethodImpl(256)] public static IEnumerable<(T, int)> WithIndex<T>(this IEnumerable<T> source) =>
source.Select((x, i) => (x, i));
[MethodImpl(256)] public static (T, U, V)[] Zip<T, U, V>(
IReadOnlyCollection<T> t,
IReadOnlyCollection<U> u,
IReadOnlyCollection<V> v
) {
Assert(t.Count == u.Count && u.Count == v.Count);
return t.Zip(u, (a, b) => (a, b))
.Zip(v, (tuple, c) => (tuple.Item1, tuple.Item2, c)).ToArray();
}
[MethodImpl(256)] public static void rep(in int start, in int end, Action<int> func) {
for (int i = start; i < end; ++i) func(i);
}
[MethodImpl(256)] public static void rep(in int end, Action<int> func) => rep(0, end, func);
[MethodImpl(256)] public static void rep1(in int end, Action<int> func) => rep(1, end + 1, func);
[MethodImpl(256)] public static void repr(in int end, Action<int> func) {
for (int i = end - 1; i >= 0; --i) func(i);
}
[MethodImpl(256)]
public static void each<T>(this IEnumerable<T> source, Action<T> func) {
foreach (var item in source) func(item);
}
[MethodImpl(256)]
public static void eachWithIndex<T>(this IEnumerable<T> source, Action<T, int> func) {
int index = 0; foreach (var item in source) func(item, index++);
}
[MethodImpl(256)] public static int bit(in int x) => 1 << x;
[MethodImpl(256)] public static long bitl(in int x) => 1L << x;
}
public class UnorderedMap<T, U> : Dictionary<T, U>
{
public new U this[T k] {
get =>
TryGetValue(k, out var v) ? v : base[k] = default;
set =>
base[k] = value;
}
}
public class Map<T, U> : SortedDictionary<T, U>
{
readonly U _default;
public Map(U defaultValue = default) {
_default = defaultValue;
}
public new U this[T k] {
get =>
TryGetValue(k, out var v) ? v : base[k] = _default;
set =>
base[k] = value;
}
}
public class Scanner<T>
{
public T r => next<T>();
public T next() => r;
IEnumerable<T> enumerable(int N) { for (int i = 0; i < N; ++i) yield return r; }
public T[] array(in int N) => enumerable(N).ToArray();
public List<T> list(in int N) => enumerable(N).ToList();
public T[,] array2d(in int N, in int M) => next2DArray<T>(N, M);
public T[][] listArray(in int n) {
var ret = new T[n][];
for (int i = 0; i < n; i++) ret[i] = array(next<int>());
return ret;
}
public void Deconstruct(out T _1, out T _2) => (_1, _2) = (r, r);
public void Deconstruct(out T _1, out T _2, out T _3) => (_1, _2, _3) = (r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4) =>
(_1, _2, _3, _4) = (r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4, out T _5) =>
(_1, _2, _3, _4, _5) = (r, r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4, out T _5, out T _6) =>
(_1, _2, _3, _4, _5, _6) = (r, r, r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4, out T _5, out T _6, out T _7) =>
(_1, _2, _3, _4, _5, _6, _7) = (r, r, r, r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4, out T _5, out T _6, out T _7, out T _8) =>
(_1, _2, _3, _4, _5, _6, _7, _8) = (r, r, r, r, r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4,
out T _5, out T _6, out T _7, out T _8, out T _9) =>
(_1, _2, _3, _4, _5, _6, _7, _8, _9) = (r, r, r, r, r, r, r, r, r);
public void Deconstruct(out T _1, out T _2, out T _3, out T _4,
out T _5, out T _6, out T _7, out T _8, out T _9, out T _10) =>
(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10) = (r, r, r, r, r, r, r, r, r, r);
public static implicit operator T(Scanner<T> sc) => sc.r;
}
public static class Input
{
const char _separator = ' ';
static readonly Queue<string> _input = new Queue<string>();
static readonly StreamReader sr =
#if FILE
new StreamReader("in.txt");
#else
new StreamReader(Console.OpenStandardInput());
#endif
public static string ReadLine => sr.ReadLine();
static string ReadStr => Read;
static int ReadInt => int.Parse(Read);
static long ReadLong => long.Parse(Read);
static ulong ReadULong => ulong.Parse(Read);
static double ReadDouble => double.Parse(Read);
static BigInteger ReadBigInteger => BigInteger.Parse(Read);
public static string Read {
get {
if (_input.Any()) return _input.Dequeue();
foreach (var val in sr.ReadLine().Split(_separator)) _input.Enqueue(val);
return _input.Dequeue();
}
}
public static string next() => Read;
public static T next<T>() =>
default(T) switch {
sbyte _ => (T) (object) (sbyte) ReadInt,
short _ => (T) (object) (short) ReadInt,
int _ => (T) (object) ReadInt,
long _ => (T) (object) ReadLong,
byte _ => (T) (object) (byte) ReadULong,
ushort _ => (T) (object) (ushort) ReadULong,
uint _ => (T) (object) (uint) ReadULong,
ulong _ => (T) (object) ReadULong,
float _ => (T) (object) (float) ReadDouble,
double _ => (T) (object) ReadDouble,
string _ => (T) (object) ReadStr,
char _ => (T) (object) ReadStr[0],
BigInteger _ => (T) (object) ReadBigInteger,
_ => typeof(T) == typeof(string)
? (T) (object) ReadStr
: throw new NotSupportedException(),
};
public static (T, U) next<T, U>() => (next<T>(), next<U>());
public static (T, U, V) next<T, U, V>() => (next<T>(), next<U>(), next<V>());
public static (T, U, V, W) next<T, U, V, W>() => (next<T>(), next<U>(), next<V>(), next<W>());
public static (T, U, V, W, X) next<T, U, V, W, X>() => (next<T>(), next<U>(), next<V>(), next<W>(), next<X>());
public static T[] nextArray<T>(in int size) {
var ret = new T[size]; for (int i = 0; i < size; ++i) ret[i] = next<T>(); return ret;
}
public static T[,] next2DArray<T>(int n, in int m) {
var ret = new T[n, m];
for (int i = 0; i < n; ++i) for (int j = 0; j < n; ++j) ret[i, j] = next<T>(); return ret;
}
public static (T[], U[]) nextArray<T, U>(in int size) {
var ret1 = new T[size]; var ret2 = new U[size];
for (int i = 0; i < size; ++i) (ret1[i], ret2[i]) = next<T, U>();
return (ret1, ret2);
}
public static (T[], U[], V[]) nextArray<T, U, V>(in int size) {
var ret1 = new T[size]; var ret2 = new U[size]; var ret3 = new V[size];
for (int i = 0; i < size; ++i) (ret1[i], ret2[i], ret3[i]) = next<T, U, V>();
return (ret1, ret2, ret3);
}
}
public static class Output
{
[MethodImpl(256)] public static void print() => Console.WriteLine();
[MethodImpl(256)] public static void print(in string s, bool endline = true) {
if (endline) Console.WriteLine(s); else Console.Write(s);
}
[MethodImpl(256)] public static void print(in char s, bool endline = true) {
if (endline) Console.WriteLine(s); else Console.Write(s);
}
[MethodImpl(256)] public static void print(in int v, bool endline = true) {
if (endline) Console.WriteLine(v); else Console.Write(v);
}
[MethodImpl(256)] public static void print(in long v, bool endline = true) {
if (endline) Console.WriteLine(v); else Console.Write(v);
}
[MethodImpl(256)] public static void print(in ulong v, bool endline = true) {
if (endline) Console.WriteLine(v); else Console.Write(v);
}
[MethodImpl(256)] public static void print(in bool b) => PrintBool(b);
[MethodImpl(256)] public static void print(in object v) => Console.WriteLine(v);
[MethodImpl(256)] public static void print<T>(in IEnumerable<T> array, string separator = " ") =>
Console.WriteLine(array.Join(separator));
[MethodImpl(256)] public static void prints<T>(params T[] t) => print(t);
#if LOCAL
[MethodImpl(256)] public static void debug<T>(in T value, bool endline = true) {
if (endline) Console.WriteLine(value);else Console.Write(value);
}
#else
public static void debug(params object[] obj) { }
#endif
[MethodImpl(256)] static void PrintBool(in bool val, in string yes = null, in string no = null) =>
print(val ? yes ?? _yes : no ?? _no);
static string _yes = "Yes", _no = "No";
public static void SetYesNoString(in YesNoType t) => (_yes, _no) = YesNoString[t];
public static void SetYesNoString(in string yes, in string no) => (_yes, _no) = (yes, no);
static readonly Dictionary<YesNoType, (string yes, string no)>
YesNoString = new Dictionary<YesNoType, (string, string)> {
{YesNoType.Yes_No, ("Yes", "No")},
{YesNoType.YES_NO, ("YES", "NO")},
{YesNoType.Upper, ("YES", "NO")},
{YesNoType.yes_no, ("yes", "no")},
{YesNoType.Lower, ("yes", "no")},
{YesNoType.Possible_Impossible, ("Possible", "Impossible")},
{YesNoType.Yay, ("Yay!", ":(")},
};
public static readonly (string yes, string no) YN_Possible = ("Possible", "Impossible"),
YN_lower = ("yes", "no"), YN_upper = ("YES", "NO"), YN_Yay = ("Yay!", ":(");
public static void Yes() => print(_yes);
public static void No() => print(_no);
public static object cout { set => Console.WriteLine(value); }
#if LOCAL
public static object dout { set => Console.WriteLine(value); }
#else
public static object dout { set { } }
#endif
public static object cerr { set => Console.Error.WriteLine(value); }
public const string endl = "\n";
public enum YesNoType { Yes_No, YES_NO, Upper, yes_no, Lower, Possible_Impossible, Yay }
}
public class Program
{
public static void Main(string[] args) {
var sw = new StreamWriter(Console.OpenStandardOutput()) {AutoFlush = false};
Console.SetOut(sw);
new Solver().Main();
Console.Out.Flush();
}
}
partial class Solver
{
readonly Scanner<int> Int;
readonly Scanner<long> Long;
readonly Scanner<string> String;
public Solver() => (Int, String, Long) = (new Scanner<int>(), new Scanner<string>(), new Scanner<long>());
const int INF = 1000000010;
const long LINF = 1000000000000000100;
const double EPS = 1e-9;
public static readonly int[] dx = {-1, 0, 0, 1, -1, -1, 1, 1}, dy = {0, 1, -1, 0, -1, 1, -1, 1};
}
}namespace Solve.Libraries.ModInt
{
[DebuggerDisplay("{" + nameof(_value) + "}")]
public struct ModInt : IEquatable<ModInt>, IComparable<ModInt> {
public const int MOD = 998_244_353; //1_000_000_007;
long _value;
public static readonly ModInt Zero = new ModInt(0);
public static readonly ModInt One = new ModInt(1);
public ModInt(in long value) => _value = (value % MOD + MOD) % MOD;
public int Value => (int) _value;
public ModInt Invert => ModPow(this, MOD - 2);
public static ModInt operator -(ModInt value) {
value._value = MOD - value._value;
return value;
}
public static ModInt operator +(ModInt left, in ModInt right) {
left._value += right._value;
if (left._value >= MOD) left._value -= MOD;
return left;
}
public static ModInt operator -(ModInt left, in ModInt right) {
left._value -= right._value;
if (left._value < 0) left._value += MOD;
return left;
}
public static ModInt operator *(ModInt left, in ModInt right) => left._value * right._value % MOD;
public static ModInt operator /(ModInt left, in ModInt right) => left * right.Invert;
public static ModInt operator ++(ModInt value) {
if (value._value == MOD - 1) value._value = 0;
else value._value++;
return value;
}
public static ModInt operator --(ModInt value) {
if (value._value == 0) value._value = MOD - 1;
else value._value--;
return value;
}
public static bool operator ==(ModInt left, in ModInt right) => left.Equals(right);
public static bool operator !=(ModInt left, in ModInt right) => !left.Equals(right);
public static implicit operator ModInt(in int value) => new ModInt(value);
public static implicit operator ModInt(in long value) => new ModInt(value);
public static explicit operator int(ModInt m) => m.Value;
public static ModInt ModPow(ModInt value, long exponent) {
var r = new ModInt(1);
for (; exponent > 0; value *= value, exponent >>= 1)
if ((exponent & 1) == 1)
r *= value;
return r;
}
public static ModInt ModFact(int value) {
var r = new ModInt(1);
for (var i = 2; i <= value; i++) r *= value;
return r;
}
public bool Equals(ModInt other) => _value == other._value;
public override bool Equals(object obj) => obj is ModInt m && Equals(m);
public override int GetHashCode() => _value.GetHashCode();
public override string ToString() => _value.ToString();
public int CompareTo(ModInt other) => _value.CompareTo(other._value);
}
}
namespace Solve.Libraries.SegmentTree.SegmentTree
{
public class SegmentTree<T>
{
readonly int _size;
readonly T[] _seg;
readonly Func<T, T, T> _func;
readonly T _identity;
public SegmentTree(int N, Func<T, T, T> func, T identity = default) {
_func = func;
_identity = identity;
_size = 1 << (int) System.Math.Ceiling(System.Math.Log(N, 2));
_seg = Enumerable.Repeat(_identity, _size * 2).ToArray();
}
public void Set(int i, T value) {
if (i < 0 || i >= _size) throw new ArgumentOutOfRangeException(nameof(i));
_seg[_size + i] = value;
}
public void Build() {
for (int i = _size - 1; i > 0; i--) _seg[i] = _func(_seg[2 * i], _seg[2 * i + 1]);
}
public void Update(int i, T value) {
i += _size;
_seg[i] = value;
while ((i >>= 1) > 0) _seg[i] = _func(_seg[2 * i], _seg[2 * i + 1]);
}
public T Query(int l, int r) {
T L = _identity, R = _identity;
for (l += _size, r += _size; l < r; l >>= 1, r >>= 1) {
if ((l & 1) > 0) L = _func(L, _seg[l++]);
if ((r & 1) > 0) R = _func(_seg[--r], R);
}
return _func(L, R);
}
public int FindSubtree(int a, Func<T, bool> check, T M, bool type) {
int t = type ? 1 : 0;
while (a < _size) {
var nxt = type ? _func(_seg[2 * a + t], M) : _func(M, _seg[2 * a + t]);
if (check(nxt)) a = 2 * a + t;
else (M, a) = (nxt, 2 * a + 1 - t);
}
return a - _size;
}
public int FindFirst(int a, Func<T, bool> check) {
var L = _identity;
if (a <= 0) {
if (check(_func(L, _seg[1]))) return FindSubtree(1, check, L, false);
return -1;
}
int b = _size;
for (a += _size, b += _size; a < b; a >>= 1, b >>= 1) {
if ((a & 1) != 0) {
var nxt = _func(L, _seg[a]);
if (check(nxt)) return FindSubtree(a, check, L, false);
L = nxt;
++a;
}
}
return -1;
}
public int FindLast(int b, Func<T, bool> check) {
var R = _identity;
if (b >= _size) {
if (check(_func(_seg[1], R))) return FindSubtree(1, check, R, true);
return -1;
}
int a = _size;
for (b += _size; a < b; a >>= 1, b >>= 1) {
if ((b & 1) != 0) {
var nxt = _func(_seg[--b], R);
if (check(nxt)) return FindSubtree(b, check, R, true);
R = nxt;
}
}
return -1;
}
public T this[int i] => _seg[i + _size];
}
}