結果

問題 No.172 UFOを捕まえろ
ユーザー mnznmnzn
提出日時 2020-04-24 02:08:38
言語 C#(csc)
(csc 3.9.0)
結果
AC  
実行時間 25 ms / 5,000 ms
コード長 5,220 bytes
コンパイル時間 2,600 ms
コンパイル使用メモリ 107,520 KB
実行使用メモリ 18,176 KB
最終ジャッジ日時 2024-10-14 11:08:40
合計ジャッジ時間 3,929 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 23 ms
18,176 KB
testcase_01 AC 23 ms
18,176 KB
testcase_02 AC 23 ms
18,048 KB
testcase_03 AC 24 ms
17,920 KB
testcase_04 AC 22 ms
18,048 KB
testcase_05 AC 21 ms
18,048 KB
testcase_06 AC 22 ms
17,920 KB
testcase_07 AC 22 ms
17,920 KB
testcase_08 AC 23 ms
17,792 KB
testcase_09 AC 23 ms
17,664 KB
testcase_10 AC 24 ms
17,920 KB
testcase_11 AC 22 ms
18,048 KB
testcase_12 AC 22 ms
18,176 KB
testcase_13 AC 23 ms
17,664 KB
testcase_14 AC 23 ms
17,920 KB
testcase_15 AC 23 ms
18,048 KB
testcase_16 AC 22 ms
18,176 KB
testcase_17 AC 23 ms
18,176 KB
testcase_18 AC 23 ms
18,048 KB
testcase_19 AC 22 ms
18,048 KB
testcase_20 AC 22 ms
18,176 KB
testcase_21 AC 25 ms
17,792 KB
testcase_22 AC 23 ms
18,048 KB
testcase_23 AC 23 ms
17,792 KB
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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.Collections.Generic;
using System.IO;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }
    static void Solve()
    {
        var X = sc.ReadInt();
        var Y = sc.ReadInt();
        var R = sc.ReadInt();
        var ans = 0;
        for (int i = 1000 - 1; i >= 0; i--)
        {
            var d = Distance(X, Y, 0, i, i, 0);
            d = Math.Min(d, Distance(X, Y, i, 0, 0, -i));
            d = Math.Min(d, Distance(X, Y, 0, -i, -i, 0));
            d = Math.Min(d, Distance(X, Y, -i, 0, 0, i));
            if (d >= R)
            {
                ans = i;
            }
            else break;
        }
        Console.WriteLine(ans);
    }
    // 点(x0, y0)と2点(x1, y1)(x2, y2)を通る直線の距離を返す
    static double Distance(double x0, double y0, double x1, double y1, double x2, double y2)
    {
        var a = x2 - x1;
        var b = y2 - y1;
        var a2 = a * a;
        var b2 = b * b;
        var r2 = a2 + b2;
        var tt = -(a * (x1 - x0) + b * (y1 - y0));
        if (tt < 0)
        {
            return (x1 - x0) * (x1 - x0) + (y1 - y0) * (y1 - y0);
        }
        if (tt > r2)
        {
            return (x2 - x0) * (x2 - x0) + (y2 - y0) * (y2 - y0);
        }
        var f1 = a * (y1 - y0) - b * (x1 - x0);
        return Math.Sqrt((f1 * f1) / r2);
    }
    static Scanner sc = new Scanner();
}
class Scanner
{
    string[] S = new string[0];
    int Index = 0;
    char[] Separators = new char[] { ' ' };

    public string Next()
    {
        if (this.Index < this.S.Length) return this.S[this.Index++];
        var line = "";
        while (line == "") line = Console.ReadLine();
        this.S = line.Split(this.Separators, StringSplitOptions.RemoveEmptyEntries);
        if (this.S.Length == 0) return this.Next();
        this.Index = 0;
        return this.S[this.Index++];
    }
    public string ReadStr()
    {
        return this.Next();
    }
    public char ReadChar()
    {
        return this.Next()[0];
    }
    public int ReadInt()
    {
        return int.Parse(this.Next());
    }
    public uint ReadUInt()
    {
        return uint.Parse(this.Next());
    }
    public long ReadLong()
    {
        return long.Parse(this.Next());
    }
    public double ReadDouble()
    {
        return double.Parse(this.Next());
    }
    public Tuple<int, int> ReadTup(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add);
    }
    public Tuple<long, long> ReadTupLong(int add = 0)
    {
        return Tuple.Create(this.ReadLong() + add, this.ReadLong() + add);
    }
    public Tuple<int, int, int> ReadTup3(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add);
    }
    public Tuple<int, int, int, int> ReadTup4(int add = 0)
    {
        return Tuple.Create(this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add, this.ReadInt() + add);
    }
    public int[] ReadIntArray(int n)
    {
        var array = new int[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadInt();
        }
        return array;
    }
    public long[] ReadLongArray(int n)
    {
        var array = new long[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadLong();
        }
        return array;
    }
    public double[] ReadDoubleArray(int n)
    {
        var array = new double[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadDouble();
        }
        return array;
    }
    public char[] ReadCharArray(int n)
    {
        var array = new char[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadChar();
        }
        return array;
    }
    public string[] ReadStrArray(int n)
    {
        var array = new string[n];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = this.ReadStr();
        }
        return array;
    }
    public Tuple<long, long>[] ReadTupLongArray(int n, int add = 0)
    {
        var array = new Tuple<long, long>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTupLong(add);
        }
        return array;
    }
    public Tuple<int, int>[] ReadTupArray(int n, int add = 0)
    {
        var array = new Tuple<int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup(add);
        }
        return array;
    }
    public Tuple<int, int, int>[] ReadTup3Array(int n, int add = 0)
    {
        var array = new Tuple<int, int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup3(add);
        }
        return array;
    }
    public Tuple<int, int, int, int>[] ReadTup4Array(int n, int add = 0)
    {
        var array = new Tuple<int, int, int, int>[n];
        for (int i = 0; i < n; i++)
        {
            array[i] = this.ReadTup4(add);
        }
        return array;
    }
}
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