結果

問題 No.978 Fibonacci Convolution Easy
ユーザー fgwiebfaoish
提出日時 2020-02-01 05:19:03
言語 C#(csc)
(csc 3.9.0)
結果
RE  
実行時間 -
コード長 3,855 bytes
コンパイル時間 2,652 ms
コンパイル使用メモリ 115,388 KB
実行使用メモリ 40,896 KB
最終ジャッジ日時 2024-09-18 19:39:48
合計ジャッジ時間 4,277 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 20 RE * 1
権限があれば一括ダウンロードができます
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

diff #
プレゼンテーションモードにする

using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
    const int mod=(int)1e9+7;
    static void Main(){
        Sc sc=new Sc();
        var s=sc.Ia;
        var a=new Mint[s[0]];
        a[1]=1;
        for(int i = 2;i<s[0];i++) {a[i]=a[i-1]*s[1]+a[i-2];}
        Mint p=0,ans=0;
        for(int i = s[0]-1;i>0;i--) {
            p+=a[i];
            ans+=a[i]*p;
        }
        Console.WriteLine("{0}",ans);
    }
}
public struct Mint{
    const int mod=(int)1e9+7;
    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=(a.d+b)%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;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=(a.d*b)%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;}
    private 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;a^=b;
            u-=t*v;u^=v;v^=u;u^=v;
        }
        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(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
    public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split
        (),int.Parse);}
    public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
    public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
    public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split
        (),long.Parse);}
    public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
    public double[] Da3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),double.Parse);}
    public double[] Da3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).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;}
}
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