結果
問題 | No.1709 Indistinguishable by MEX |
ユーザー |
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提出日時 | 2021-10-15 22:31:14 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 154 ms / 2,000 ms |
コード長 | 5,676 bytes |
コンパイル時間 | 4,138 ms |
コンパイル使用メモリ | 108,800 KB |
実行使用メモリ | 44,032 KB |
最終ジャッジ日時 | 2024-09-17 17:43:15 |
合計ジャッジ時間 | 8,145 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 26 |
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
using System;using System.Collections.Generic;using System.Collections;using System.Collections.Specialized;using System.Linq;using System.Text;using System.Text.RegularExpressions;using System.IO;using System.Reflection;using static System.Math;using System.Numerics;using System.Threading;using System.Runtime.CompilerServices;using System.Diagnostics;//using nint=System.Int32;static class Program{const int mod=(int)1e9+7;static void Main(){Sc sc=new Sc();//var (n,m)=sc.Tp2<int>();var n=sc.I;var a=sc.Ia;var h=new int[n];var b=new bool[n+1];for(int i = 0;i<n;i++) {h[a[i]]=i;}var g=h[0];b[0]=true;Cb c=new Cb(n<<1);Mint ans=1;for(int i = 1,l=g,r=g;i<n;i++) {if(g<h[i]){g=r+1;for(int j = g;j<=h[i];j++) {b[a[j]]=true;}r=h[i];}else{g=l-1;for(int j = g;j>=h[i];j--) {b[a[j]]=true;}l=h[i];}int p=0,d=i;while(b[i+1]){i++;p++;}ans*=c.C1(r-l-d,p)*c.r[p];}Console.WriteLine("{0}",ans);}}public class Cb{private const int mod=998244353;public long[] r,f,v;public Cb(int n){r=new long[n];f=new long[n];v=new long[n];r[0]=r[1]=f[0]=f[1]=v[1]=1;for(int i=2;i<n;i++){r[i]=r[i-1]*i%mod;v[i]=mod-v[mod%i]*(mod/i)%mod;f[i]=f[i-1]*v[i]%mod;}}public long C1(long n,long k){return r[n]*(f[k]*f[n-k]%mod)%mod;}public long C2(long n,long k){long l=1;n%=mod;for(int i=1;i<=k;i++){l=l*(n-i+1)%mod;l=l*v[i]%mod;}return l;}public long C3(long n,long k){return (r[n]*Mi(r[k]*r[n-k]))%mod;}public long P1(long n,long k){return n>=k?r[n]*Mi(r[n-k])%mod:0;}public long Mi(long a){a=(a+mod)%mod;long b=mod,u=1,v=0;while(b>0){long t=a/b;a-=t*b;(a,b)=(b,a);u-=t*v;(u,v)=(v,u);}u%=mod;if(u<0){u+=mod;}return u%mod;}}public struct Mint{const int mod=998244353;private long d;public Mint(long d){this.d=d;}public static implicit operator Mint(long d){return new Mint(d%mod);}public static explicit operator long(Mint d){return d.d;}public override string ToString(){return d.ToString();}public static Mint operator+(Mint a,long b){a.d=(mod+a.d+b%mod)%mod;return a;}public static Mint operator+(Mint a,Mint b){a.d=(a.d+b.d)%mod;return a;}public static Mint operator-(Mint a,long b){a.d=(mod+a.d-b%mod)%mod;return a;}public static Mint operator-(Mint a,Mint b){a.d=(mod+a.d-b.d)%mod;return a;}public static Mint operator*(Mint a,long b){a.d=b%mod*a.d%mod;return a;}public static Mint operator*(Mint a,Mint b){a.d=a.d*b.d%mod;return a;}public static Mint operator/(Mint a,long b){a.d=a.d*Mi(b)%mod;return a;}public static Mint operator/(Mint a,Mint b){a.d=a.d*Mi(b.d)%mod;return a;}public static bool operator==(Mint a,long b){return (long)a==b;}public static bool operator!=(Mint a,long b){return (long)a!=b;}public override bool Equals(object obj){return false;}public override int GetHashCode(){return 0;}public static long Mi(long a){a=(a+mod)%mod;long b=mod,u=1,v=0;while(b>0){long t=a/b;a-=t*b;(a,b)=(b,a);u-=t*v;(u,v)=(v,u);}u%=mod;if(u<0){u+=mod;}return u%mod;}}public class Sc{public int I{get{return int.Parse(Console.ReadLine());}}public long L{get{return long.Parse(Console.ReadLine());}}public double D{get{return double.Parse(Console.ReadLine());}}public string S{get{return Console.ReadLine();}}public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}public string[] Sa{get{return Console.ReadLine().Split();}}public object[] Oa{get{return Console.ReadLine().Split();}}public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}public int[] Ia3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}public int[] Ia3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),int.Parse);}public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}public long[] La3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),long.Parse);}public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),double.Parse);}public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}public (T,T) Tp2<T>(){var s=Console.ReadLine().Split();return (Ct<T>(s[0]),Ct<T>(s[1]));}public (T,T,T) Tp3<T>(){var s=Console.ReadLine().Split();return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]));}public (T,T,T,T) Tp4<T>(){var s=Console.ReadLine().Split();return (Ct<T>(s[0]),Ct<T>(s[1]),Ct<T>(s[2]),Ct<T>(s[3]));}public (T1,T2) Tp2<T1,T2>(){var s=Console.ReadLine().Split();return (Ct<T1>(s[0]),Ct<T2>(s[1]));}public (T1,T1,T2) Tp3<T1,T2>(){var s=Console.ReadLine().Split();return (Ct<T1>(s[0]),Ct<T1>(s[1]),Ct<T2>(s[2]));}private T Ct<T>(string s){return (T)Convert.ChangeType(s,typeof(T));}}