結果

問題 No.731 等差数列がだいすき
ユーザー claw88
提出日時 2018-09-07 22:06:04
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 38 ms / 1,500 ms
コード長 2,933 bytes
コンパイル時間 1,256 ms
コンパイル使用メモリ 110,336 KB
実行使用メモリ 20,480 KB
最終ジャッジ日時 2024-11-29 13:53:43
合計ジャッジ時間 2,554 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
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 * 18
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.Linq;
using System.IO;
//using System.Text;
//using System.Text.RegularExpressions;
//using System.Globalization;
//using System.Diagnostics;
using static System.Console;
//using System.Numerics;
//using static System.Math;
//using pair = Pair<int, int>;
class Program
{
    static void Main()
    {
        //SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 }; //→↓←↑
    readonly int mod = 1000000007;
    void chmax<T>(ref T a, T b) where T : IComparable<T> { a = a.CompareTo(b) < 0 ? b : a; }
    void chmin<T>(ref T a, T b) where T : IComparable<T> { a = a.CompareTo(b) < 0 ? a : b; }
    void solve()
    {
        int N = cin.nextint;
        var A = cin.scanlong;
        var B = Enumerable.Range(0, N).ToArray();
        var aveA = A.Sum() / (double)N;
        var aveB = B.Sum() / (double)N;
        var dA = A.Select(i => i - aveA).ToArray();
        var dB = B.Select(i => i - aveB).ToArray();
        var va = 0.0;
        var vb = 0.0;
        for (int i = 0; i < N; i++)
        {
            va += dA[i] * dA[i];
            vb += dB[i] * dB[i];
        }
        va /= N;
        vb /= N;
        var sa = Math.Sqrt(va);
        var sb = Math.Sqrt(vb);
        var vx = 0.0;
        for (int i = 0; i < N; i++)
        {
            vx += (A[i] - aveA) * (B[i] - aveB); 
        }
        vx /= N;
        var soukan = vx / sa / sb;
        var kaiki = soukan * (sa / sb);
        var seppen = aveA - (kaiki * aveB);
        //A = B * kaiki + seppen;
        WriteLine(seppen.ToString("F7") + " " + kaiki.ToString("F7"));
        double cost = 0;
        for (int i = 0; i < N; i++)
        {
            double now = B[i] * kaiki + seppen;
            cost += (now - A[i]) * (now - A[i]);
        }
        WriteLine(cost.ToString("F7"));
    }
}
class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] scan { get { return ReadLine().Split(); } }
    public int[] scanint { get { return Array.ConvertAll(scan, int.Parse); } }
    public long[] scanlong { get { return Array.ConvertAll(scan, long.Parse); } }
    public double[] scandouble { get { return Array.ConvertAll(scan, double.Parse); } }
    public string next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return next;
        }
    }
    public int nextint { get { return int.Parse(next); } }
    public long nextlong { get { return long.Parse(next); } }
    public double nextdouble { get { return double.Parse(next); } }
}
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