結果

問題 No.1489 Repeat Cumulative Sum
ユーザー fgwiebfaoish
提出日時 2021-05-08 03:07:18
言語 C#(csc)
(csc 3.9.0)
結果
RE  
実行時間 -
コード長 4,353 bytes
コンパイル時間 4,035 ms
コンパイル使用メモリ 108,032 KB
実行使用メモリ 19,732 KB
最終ジャッジ日時 2024-09-15 19:16:50
合計ジャッジ時間 5,667 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge1
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
sample AC * 3
other AC * 1 RE * 26
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;
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 a=sc.Ia2;
        Mint ans=0,p=m;
        for(int i = 1;i<n;i++) {
            ans+=p*a[n-i];
            p=p*(m+i)/(i+1);
        }
        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;}
    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 (T1,T2) Tp2<T1,T2>(){var s=Console.ReadLine().Split();return (Ct<T1>(s[0]),Ct<T2>(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 (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));}
}
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