結果

問題 No.980 Fibonacci Convolution Hard
ユーザー keymoon
提出日時 2019-07-11 21:11:13
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 1,205 ms / 2,000 ms
コード長 2,708 bytes
コンパイル時間 865 ms
コンパイル使用メモリ 112,624 KB
実行使用メモリ 52,352 KB
最終ジャッジ日時 2024-09-17 11:21:26
合計ジャッジ時間 23,279 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
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ファイルパターン 結果
other AC * 17
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 # 

using System;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
using static System.Math;
using Debug = System.Diagnostics.Debug;
using MethodImplOptions = System.Runtime.CompilerServices.MethodImplOptions;
using MethodImplAttribute = System.Runtime.CompilerServices.MethodImplAttribute;


static class P
{
    static void Main()
    {
        var p = int.Parse(Console.ReadLine());
        Debug.Assert(1 <= p && p <= 1000000000);
        var fibs = GetFibs(p, 2000000);
        var res = Solve(fibs);
        //var res = SolveStupid(fibs);
        var Q = int.Parse(Console.ReadLine());
        Debug.Assert(1 <= Q && Q <= 100000);
        for (int i = 0; i < Q; i++)
        {
            var q = int.Parse(Console.ReadLine());
            Debug.Assert(1 <= q && q <= 1000000);
            Console.WriteLine(res[q]);
        }
    }

    static ModInt[] Solve(ModInt[] fibs)
    {
        ModInt[] res = new ModInt[fibs.Length];
        res[2] = 0;
        res[3] = 0;
        for (int i = 4; i < res.Length; i++)
        {
            res[i] = (i - 3) * fibs[i - 2] - res[i - 2];
        }
        return res;
    }

    static ModInt[] SolveStupid(ModInt[] fibs)
    {
        ModInt[] res = new ModInt[fibs.Length * 2];
        for (int i = 1; i < fibs.Length; i++)
            for (int j = 1; j < fibs.Length; j++)
                res[i + j] += fibs[i] * fibs[j];
        return res;
    }

    static ModInt[] GetFibs(int p, int count)
    {
        ModInt[] fibs = new ModInt[count + 1];
        fibs[1] = 0;
        fibs[2] = 1;
        for (int i = 3; i < fibs.Length; i++)
            fibs[i] = fibs[i - 1] * p + fibs[i - 2];
        return fibs;
    }
}


struct ModInt
{
    const int MOD = 1000000007;
    long Data;
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public ModInt(long data) { if ((Data = data % MOD) < 0) Data += MOD; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static implicit operator long(ModInt modInt) => modInt.Data;
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static implicit operator ModInt(long val) => new ModInt(val);
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static ModInt operator +(ModInt a, ModInt b) { long res = a.Data + b.Data; return new ModInt() { Data = res >= MOD ? res - MOD : res }; }
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static ModInt operator +(ModInt a, long b) => a.Data + b;
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static ModInt operator *(ModInt a, ModInt b) => new ModInt() { Data = a.Data * b.Data % MOD };
}
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