結果
| 問題 | No.2689 Populous |
| ユーザー |
 KumaTachiRen
|
| 提出日時 | 2024-03-20 23:32:13 |
| 言語 | C# (.NET 8.0.203) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 18,601 bytes |
| コンパイル時間 | 9,447 ms |
| コンパイル使用メモリ | 158,948 KB |
| 実行使用メモリ | 191,304 KB |
| 最終ジャッジ日時 | 2024-03-20 23:32:26 |
| 合計ジャッジ時間 | 11,715 ms |
|
ジャッジサーバーID （参考情報） |
judge13 / judge12 |
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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 | 75 ms
37,920 KB |
| testcase_01 | AC | 57 ms
30,884 KB |
| testcase_02 | AC | 73 ms
37,920 KB |
| testcase_03 | WA | - |
| testcase_04 | WA | - |
| testcase_05 | WA | - |
| testcase_06 | WA | - |
| testcase_07 | AC | 73 ms
37,920 KB |
| testcase_08 | WA | - |
| testcase_09 | AC | 58 ms
30,884 KB |
| testcase_10 | WA | - |
| testcase_11 | AC | 73 ms
37,920 KB |
| testcase_12 | AC | 75 ms
37,920 KB |
| testcase_13 | AC | 73 ms
37,920 KB |
| testcase_14 | WA | - |
| testcase_15 | AC | 75 ms
37,920 KB |
| testcase_16 | AC | 76 ms
37,920 KB |
| testcase_17 | AC | 76 ms
37,920 KB |
| testcase_18 | WA | - |
| testcase_19 | AC | 74 ms
37,920 KB |
| testcase_20 | AC | 93 ms
40,524 KB |
| testcase_21 | AC | 91 ms
40,524 KB |
| testcase_22 | AC | 91 ms
40,524 KB |
| testcase_23 | WA | - |
| testcase_24 | WA | - |
| testcase_25 | WA | - |
| testcase_26 | WA | - |
| testcase_27 | WA | - |
| testcase_28 | WA | - |
| testcase_29 | WA | - |
| testcase_30 | WA | - |
コンパイルメッセージ
復元対象のプロジェクトを決定しています... /home/judge/data/code/main.csproj を復元しました (105 ms)。 MSBuild のバージョン 17.7.3+8ec440e68 (.NET) /home/judge/data/code/Main.cs(94,4102): warning CS8632: '#nullable' 注釈コンテキスト内のコードでのみ、Null 許容参照型の注釈を使用する必要があります。 [/home/judge/data/code/main.csproj] main -> /home/judge/data/code/bin/Release/net7.0/main.dll main -> /home/judge/data/code/bin/Release/net7.0/publish/
ソースコード
using System;
using System.ComponentModel;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
using static Functions;
using static OutputLib;
using ModInt = StaticModInt<Mod998244353>;
static class Program
{
static public void Main(string[] args)
{
Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false });
new Solver();
Console.Out.Flush();
}
}
public class Solver
{
public Solver()
{
Solve();
}
void Solve()
{
int h = ri, w = ri;
var a = new int[h, w];
for (int i = 0; i < h; i++)
for (int j = 0; j < w; j++)
a[i, j] = -1;
for (int j = 0; j < w; j++) a[0, j] = ri;
for (int i = 1; i < h - 1; i++) (a[i, 0], a[i, w - 1]) = ri2;
for (int j = 0; j < w; j++) a[h - 1, j] = ri;
bool ok = true;
for (int j = 0; j + 1 < w; j++) ok &= Math.Abs(a[0, j] - a[0, j + 1]) <= 1;
for (int j = 0; j + 1 < w; j++) ok &= Math.Abs(a[h - 1, j] - a[h - 1, j + 1]) <= 1;
for (int i = 0; i + 1 < h; i++) ok &= Math.Abs(a[i, 0] - a[i + 1, 0]) <= 1;
for (int i = 0; i + 1 < h; i++) ok &= Math.Abs(a[i, w - 1] - a[i + 1, w - 1]) <= 1;
if (!ok)
{
Write(-1);
return;
}
int cx = 0, cy = 0;
for (int i = 1; i < h - 1; i++) if (Math.Abs(a[i, 0] - a[i, w - 1]) >= w) cx++;
for (int j = 1; j < w - 1; j++) if (Math.Abs(a[0, j] - a[h - 1, j]) >= h) cy++;
var fact = new ModFact<Mod998244353>(1000000);
ModInt ans = 0;
int n = h, m = w;
if (cx > cy)
{
Swap(ref n, ref m);
Swap(ref cx, ref cy);
}
for (int k = 0; k <= cx; k++)
ans += ((ModInt)n - 2 - cx + k).Pow(cy) * fact.Binom(cx, k) * ((cx - k) % 2 == 0 ? 1 : -1);
Write(ans);
}
const long INF = 1L << 60;
int ri { [MethodImpl(256)] get => (int)sc.Integer(); }
(int, int) ri2 { [MethodImpl(256)] get => (ri, ri); }
(int, int, int) ri3 { [MethodImpl(256)] get => (ri, ri, ri); }
(int, int, int, int) ri4 { [MethodImpl(256)] get => (ri, ri, ri, ri); }
(int, int, int, int, int) ri5 { [MethodImpl(256)] get => (ri, ri, ri, ri, ri); }
long rl { [MethodImpl(256)] get => sc.Integer(); }
(long, long) rl2 { [MethodImpl(256)] get => (rl, rl); }
(long, long, long) rl3 { [MethodImpl(256)] get => (rl, rl, rl); }
(long, long, long, long) rl4 { [MethodImpl(256)] get => (rl, rl, rl, rl); }
(long, long, long, long, long) rl5 { [MethodImpl(256)] get => (rl, rl, rl, rl, rl); }
uint rui { [MethodImpl(256)] get => (uint)sc.UInteger(); }
ulong rul { [MethodImpl(256)] get => sc.UInteger(); }
double rd { [MethodImpl(256)] get => sc.Double(); }
string rs { [MethodImpl(256)] get => sc.Scan(); }
string rline { [MethodImpl(256)] get => sc.Line(); }
public StreamScanner sc = new StreamScanner(Console.OpenStandardInput());
}
public static class Functions { [MethodImpl(256)] public static int Popcount(ulong x) { x = (x & 0x5555555555555555UL) + ((x >> 1) & 0x5555555555555555UL); x = (x & 0x3333333333333333UL) + ((x >> 2) & 0x3333333333333333UL); x = (x & 0x0f0f0f0f0f0f0f0fUL) + ((x >> 4) & 0x0f0f0f0f0f0f0f0fUL); x = (x & 0x00ff00ff00ff00ffUL) + ((x >> 8) & 0x00ff00ff00ff00ffUL); x = (x & 0x0000ffff0000ffffUL) + ((x >> 16) & 0x0000ffff0000ffffUL); x = (x & 0x00000000ffffffffUL) + ((x >> 32) & 0x00000000ffffffffUL); return (int)x; } [MethodImpl(256)] public static int Popcount(long x) { x = (x & 0x5555555555555555L) + ((x >> 1) & 0x5555555555555555L); x = (x & 0x3333333333333333L) + ((x >> 2) & 0x3333333333333333L); x = (x & 0x0f0f0f0f0f0f0f0fL) + ((x >> 4) & 0x0f0f0f0f0f0f0f0fL); x = (x & 0x00ff00ff00ff00ffL) + ((x >> 8) & 0x00ff00ff00ff00ffL); x = (x & 0x0000ffff0000ffffL) + ((x >> 16) & 0x0000ffff0000ffffL); x = (x & 0x00000000ffffffffL) + ((x >> 32) & 0x00000000ffffffffL); return (int)x; } [MethodImpl(256)] public static int Popcount(int x) { x = (x & 0x55555555) + ((x >> 1) & 0x55555555); x = (x & 0x33333333) + ((x >> 2) & 0x33333333); x = (x & 0x0f0f0f0f) + ((x >> 4) & 0x0f0f0f0f); x = (x & 0x00ff00ff) + ((x >> 8) & 0x00ff00ff); x = (x & 0x0000ffff) + ((x >> 16) & 0x0000ffff); return x; } [MethodImpl(256)] public static int Ctz(long x) { if (x == 0) return -1; return Popcount((ulong)((x & -x) - 1)); } [MethodImpl(256)] public static int CeilPow2(int n) { int x = 0; while ((1 << x) < n) x++; return x; } [MethodImpl(256)] public static int SafeMod(int x, int m) { int r = x % m; return r < 0 ? r + Math.Abs(m) : r; } [MethodImpl(256)] public static long SafeMod(long x, long m) { long r = x % m; return r < 0 ? r + Math.Abs(m) : r; } [MethodImpl(256)] public static int Sign(long x) => x == 0 ? 0 : (x < 0 ? -1 : 1); [MethodImpl(256)] public static int Sign(double x) => x == 0 ? 0 : (x < 0 ? -1 : 1); [MethodImpl(256)] public static int DigitSum(long n, int d = 10) { long s = 0; while (n > 0) { s += n % d; n /= d; } return (int)s; } [MethodImpl(256)] public static long Floor(long a, long b) => a >= 0 ? a / b : (a + 1) / b - 1; [MethodImpl(256)] public static long Ceil(long a, long b) => a > 0 ? (a - 1) / b + 1 : a / b; [MethodImpl(256)] public static int Gcd(int a, int b) => b == 0 ? a : Gcd(b, a % b); [MethodImpl(256)] public static uint Gcd(uint a, uint b) => b == 0 ? a : Gcd(b, a % b); [MethodImpl(256)] public static long Gcd(long a, long b) => b == 0 ? a : Gcd(b, a % b); [MethodImpl(256)] public static ulong Gcd(ulong a, ulong b) => b == 0 ? a : Gcd(b, a % b); [MethodImpl(256)] public static (long x, long y, long g) ExtGcd(long a, long b) { if (b == 0) return (Sign(a), 0, Math.Abs(a)); long c = SafeMod(a, b); var (x2, y2, g) = ExtGcd(b, c); long x = SafeMod(y2, b); long y = (g - a * x) / b; return (x, y, g); } [MethodImpl(256)] public static void Swap(ref int x, ref int y) { x ^= y; y ^= x; x ^= y; } [MethodImpl(256)] public static void Swap(ref long x, ref long y) { x ^= y; y ^= x; x ^= y; } [MethodImpl(256)] public static void Swap<T>(ref T x, ref T y) { T t = y; y = x; x = t; } [MethodImpl(256)] public static T Clamp<T>(T x, T l, T r) where T : IComparable<T> => x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r); [MethodImpl(256)] public static T Clamp<T>(ref T x, T l, T r) where T : IComparable<T> => x = x.CompareTo(l) <= 0 ? l : (x.CompareTo(r) <= 0 ? x : r); [MethodImpl(256)] public static void Chmin<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) > 0) x = y; } [MethodImpl(256)] public static void Chmax<T>(ref T x, T y) where T : IComparable<T> { if (x.CompareTo(y) < 0) x = y; } [MethodImpl(256)] public static int LowerBound(long[] arr, long val, int l = -1, int r = -1) => LowerBound(arr.AsSpan(), t => Sign(t - val), l, r); [MethodImpl(256)] public static int LowerBound(int[] arr, int val, int l = -1, int r = -1) => LowerBound(arr.AsSpan(), t => t - val, l, r); [MethodImpl(256)] public static int LowerBound<T>(T[] arr, T val, int l = -1, int r = -1) where T : IComparable<T> => LowerBound(arr.AsSpan(), t => t.CompareTo(val), l, r); [MethodImpl(256)] public static int LowerBound<T>(T[] arr, Func<T, int> comp, int l = -1, int r = -1) => LowerBound(arr.AsSpan(), comp, l, r); [MethodImpl(256)] public static int LowerBound<T>(Span<T> data, Func<T, int> comp, int l = -1, int r = -1) { if (data.Length == 0) return -1; if (l == -1) l = 0; if (r == -1) r = data.Length; while (l < r) { int x = (l + r) / 2; if (comp(data[x]) < 0) l = x + 1; else r = x; } return l; } [MethodImpl(256)] public static int RangeCount<T>(T[] arr, T geq, T lt, int l = -1, int r = -1) where T : IComparable<T> => Math.Max(0, LowerBound(arr.AsSpan(), t => t.CompareTo(lt), l, r) - LowerBound(arr.AsSpan(), t => t.CompareTo(geq), l, r)); [MethodImpl(256)] public static string ToBase2(long v, int digit = -1) { if (digit == -1) { digit = 0; while ((v >> digit) > 0) digit++; } var c = new string[digit]; for (int i = 0; i < digit; i++) c[digit - 1 - i] = ((v >> i) & 1) == 0 ? "0" : "1"; return string.Join("", c); } [MethodImpl(256)] public static string ToBaseN(long v, int n, int digit = -1) { if (digit == -1) { digit = 0; long pow = 1; while (v >= pow) { digit++; pow *= n; } } var c = new int[digit]; for (int i = 0; i < digit; i++, v /= n) c[digit - 1 - i] = (int)(v % n); return string.Join("", c); } }
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; } } [MethodImpl(256)] 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++]; } [MethodImpl(256)] public char Char() { byte b = 0; do b = read(); while (b < 33 || 126 < b); return (char)b; } [MethodImpl(256)] public string Line() { var sb = new StringBuilder(); for (var b = Char(); b != 10 && !isEof; b = (char)read()) sb.Append(b); return sb.ToString(); } [MethodImpl(256)] public string Scan() { var sb = new StringBuilder(); for (var b = Char(); b >= 33 && b <= 126; b = (char)read()) sb.Append(b); return sb.ToString(); } [MethodImpl(256)] public long Integer() { 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'; } } [MethodImpl(256)] public ulong UInteger() { ulong ret = 0; byte b = 0; do b = read(); while (b < '0' || '9' < b); for (; true; b = read()) { if (b < '0' || '9' < b) return ret; else ret = ret * 10 + b - '0'; } } [MethodImpl(256)] public double Double() => double.Parse(Scan()); }
public static class OutputLib { [MethodImpl(256)] public static void WriteJoin<T>(string s, IEnumerable<T> t) => Console.WriteLine(string.Join(s, t)); [MethodImpl(256)] public static void WriteMat<T>(T[,] a, string sep = " ") { int sz1 = a.GetLength(0), sz2 = a.GetLength(1); var b = new T[sz2]; for (int i = 0; i < sz1; i++) { for (int j = 0; j < sz2; j++) b[j] = a[i, j]; WriteJoin(sep, b); } } [MethodImpl(256)] public static void WriteMat<T>(T[][] a, string sep = " ") { for (int i = 0; i < a.Length; i++) WriteJoin(sep, a[i]); } [MethodImpl(256)] public static void WriteMat<T>(T[][] a, Func<T, string> map, string sep = " ") { for (int i = 0; i < a.Length; i++) WriteJoin(sep, a[i].Select(x => map(x))); } [MethodImpl(256)] public static void Write(object t) => Console.WriteLine(t.ToString()); [MethodImpl(256)] public static void Write(params object[] arg) => Console.WriteLine(string.Join(" ", arg.Select(x => x.ToString()))); [MethodImpl(256)] public static void Write(string str) => Console.WriteLine(str); [MethodImpl(256)] public static void WriteFlush(object t) { Console.WriteLine(t.ToString()); Console.Out.Flush(); } [MethodImpl(256)] public static void WriteError(object t) => Console.Error.WriteLine(t.ToString()); [MethodImpl(256)] public static void Flush() => Console.Out.Flush(); [MethodImpl(256)] public static void YN(bool t) => Console.WriteLine(t ? "YES" : "NO"); [MethodImpl(256)] public static void Yn(bool t) => Console.WriteLine(t ? "Yes" : "No"); [MethodImpl(256)] public static void yn(bool t) => Console.WriteLine(t ? "yes" : "no"); [MethodImpl(256)] public static void DeleteLine() => Console.Write("\x1b[1A\x1b[2K"); [MethodImpl(256)] public static void ProgressBar(long now, long total, int blocks = 50) { int x = (int)((2 * now * blocks + 1) / (2 * total)); Console.Write($"\x1b[G[\x1b[42m{string.Concat(Enumerable.Repeat("_", x))}\x1b[0m{string.Concat(Enumerable.Repeat("_", blocks - x))}] : {now} / {total}"); } }
public interface IStaticMod { uint Mod { get; } bool IsPrime { get; } } public readonly struct Mod1000000007 : IStaticMod { public uint Mod => 1000000007; public bool IsPrime => true; } public readonly struct Mod998244353 : IStaticMod { public uint Mod => 998244353; public bool IsPrime => true; } public readonly struct StaticModInt<T> : IEquatable<StaticModInt<T>> where T : struct, IStaticMod { internal readonly uint _v; private static readonly T op = default; public int Value => (int)_v; public static int Mod => (int)op.Mod; public static StaticModInt<T> Zero => default; public static StaticModInt<T> One => new StaticModInt<T>(1u); [MethodImpl(256)] public static StaticModInt<T> Raw(int v) { var u = unchecked((uint)v); return new StaticModInt<T>(u); } [MethodImpl(256)] public StaticModInt(long v) : this(Round(v)) { } [MethodImpl(256)] public StaticModInt(ulong v) : this((uint)(v % op.Mod)) { } [MethodImpl(256)] private StaticModInt(uint v) => _v = v; [MethodImpl(256)] private static uint Round(long v) { var x = v % op.Mod; if (x < 0) x += op.Mod; return (uint)x; } [MethodImpl(256)] public static StaticModInt<T> operator ++(StaticModInt<T> v) { var x = v._v + 1; if (x == op.Mod) x = 0; return new StaticModInt<T>(x); } [MethodImpl(256)] public static StaticModInt<T> operator --(StaticModInt<T> v) { var x = v._v; if (x == 0) x = op.Mod; return new StaticModInt<T>(x - 1); } [MethodImpl(256)] public static StaticModInt<T> operator +(StaticModInt<T> lhs, StaticModInt<T> rhs) { var v = lhs._v + rhs._v; if (v >= op.Mod) v -= op.Mod; return new StaticModInt<T>(v); } [MethodImpl(256)] public static StaticModInt<T> operator -(StaticModInt<T> lhs, StaticModInt<T> rhs) { unchecked { var v = lhs._v - rhs._v; if (v >= op.Mod) v += op.Mod; return new StaticModInt<T>(v); } } [MethodImpl(256)] public static StaticModInt<T> operator *(StaticModInt<T> lhs, StaticModInt<T> rhs) => new StaticModInt<T>((uint)((ulong)lhs._v * rhs._v % op.Mod)); [MethodImpl(256)] public static StaticModInt<T> operator /(StaticModInt<T> lhs, StaticModInt<T> rhs) => new StaticModInt<T>((uint)((ulong)lhs._v * Inv(rhs._v) % op.Mod)); [MethodImpl(256)] public static StaticModInt<T> operator +(StaticModInt<T> v) => v; [MethodImpl(256)] public static StaticModInt<T> operator -(StaticModInt<T> v) => new StaticModInt<T>(v._v == 0 ? 0 : op.Mod - v._v); [MethodImpl(256)] public static bool operator ==(StaticModInt<T> lhs, StaticModInt<T> rhs) => lhs._v == rhs._v; [MethodImpl(256)] public static bool operator !=(StaticModInt<T> lhs, StaticModInt<T> rhs) => lhs._v != rhs._v; [MethodImpl(256)] public static implicit operator StaticModInt<T>(int v) => new StaticModInt<T>(v); [MethodImpl(256)] public static implicit operator StaticModInt<T>(uint v) => new StaticModInt<T>((long)v); [MethodImpl(256)] public static implicit operator StaticModInt<T>(long v) => new StaticModInt<T>(v); [MethodImpl(256)] public static implicit operator StaticModInt<T>(ulong v) => new StaticModInt<T>(v); [MethodImpl(256)] public static implicit operator long(StaticModInt<T> v) => v._v; [MethodImpl(256)] public static implicit operator ulong(StaticModInt<T> v) => v._v; [MethodImpl(256)] public StaticModInt<T> Pow(long n) { var x = this; var r = new StaticModInt<T>(1U); if (n < 0) (x, n) = (x.Inv(), -n); while (n > 0) { if ((n & 1) > 0) r *= x; x *= x; n >>= 1; } return r; } [MethodImpl(256)] public StaticModInt<T> Inv() => new StaticModInt<T>(Inv(_v)); [MethodImpl(256)] static ulong Inv(ulong x) { long u = op.Mod, xu = 1, yu = 0, v = (long)x, xv = 0, yv = 1; while (v != 0) { long w = SafeMod(u, v); long q = (u - w) / v; long xw = xu - xv * q; long yw = yu - yv * q; u = v; xu = xv; yu = yv; v = w; xv = xw; yv = yw; } return (ulong)(yu < 0 ? yu + op.Mod : yu); } [MethodImpl(256)] static long SafeMod(long x, long m) { long r = x % m; if (r < 0) r += m; return r; } [MethodImpl(256)] public override string ToString() => _v.ToString(); [MethodImpl(256)] public string ToString(string format, IFormatProvider formatProvider) => _v.ToString(format, formatProvider); [MethodImpl(256)] public override bool Equals(object? obj) => obj is StaticModInt<T> m && Equals(m); [MethodImpl(256)] public bool Equals(StaticModInt<T> other) => _v == other._v; [MethodImpl(256)] public override int GetHashCode() => _v.GetHashCode(); }
public class ModFact<TMod> where TMod : struct, IStaticMod { static StaticModInt<TMod>[] fact; static StaticModInt<TMod>[] factinv; static StaticModInt<TMod>[] inv; public ModFact(long n) { if (fact == null) { fact = new StaticModInt<TMod>[n + 1]; factinv = new StaticModInt<TMod>[n + 1]; inv = new StaticModInt<TMod>[n + 1]; fact[0] = 1; for (long i = 0; i < n; i++) fact[i + 1] = fact[i] * (i + 1); factinv[n] = fact[n].Inv(); for (long i = n; i > 0; i--) factinv[i - 1] = factinv[i] * i; for (long i = 1; i <= n; i++) inv[i] = fact[i - 1] * factinv[i]; } else if (fact.Length < n + 1) { int m = fact.Length; Array.Resize(ref fact, (int)n + 1); Array.Resize(ref factinv, (int)n + 1); Array.Resize(ref inv, (int)n + 1); for (long i = m - 1; i < n; i++) fact[i + 1] = fact[i] * (i + 1); factinv[n] = fact[n].Inv(); for (long i = n; i > m; i--) factinv[i - 1] = factinv[i] * i; for (long i = m; i <= n; i++) inv[i] = fact[i - 1] * factinv[i]; } } [MethodImpl(256)] public StaticModInt<TMod> Fact(long n) => fact[n]; [MethodImpl(256)] public StaticModInt<TMod> FactInv(long n) => factinv[n]; [MethodImpl(256)] public StaticModInt<TMod> Inv(long n) { if (n == 0) throw new DivideByZeroException(); return inv[n]; } [MethodImpl(256)] public StaticModInt<TMod> Binom(long n, long k) { if (n < 0) return 0; if (n == 0) return k == 0 ? 1 : 0; return 0 <= k && k <= n ? fact[n] * factinv[k] * factinv[n - k] : 0; } [MethodImpl(256)] public StaticModInt<TMod> BinomInv(long n, long k) { if (n < 0) throw new DivideByZeroException(); if (0 <= k && k <= n) return factinv[n] * fact[k] * fact[n - k]; throw new DivideByZeroException(); } [MethodImpl(256)] public StaticModInt<TMod> Multinom(long n, long k1, long k2) { if (n < 0) return 0; if (n == 0) return k1 == 0 && k2 == 0 ? 1 : 0; long k0 = n - k1 - k2; if (k0 < 0 || k0 > n) return 0; if (k1 < 0 || k1 > n) return 0; if (k2 < 0 || k2 > n) return 0; return fact[n] * factinv[k0] * factinv[k1] * factinv[k2]; } [MethodImpl(256)] public StaticModInt<TMod> Multinom(long n, params long[] ks) { if (n < 0) return 0; long k0 = n - ks.Sum(); if (k0 < 0 || k0 > n) return 0; StaticModInt<TMod> ret = fact[n] * factinv[k0]; for (int i = 0; i < ks.Length; i++) { long k = ks[i]; if (k < 0 || k > n) return 0; ret *= factinv[k]; } return ret; } }