結果
問題 |
No.94 圏外です。(EASY)
|
ユーザー |
![]() |
提出日時 | 2016-09-23 09:26:17 |
言語 | C#(csc) (csc 3.9.0) |
結果 |
AC
|
実行時間 | 55 ms / 5,000 ms |
コード長 | 3,467 bytes |
コンパイル時間 | 1,089 ms |
コンパイル使用メモリ | 110,976 KB |
実行使用メモリ | 20,608 KB |
最終ジャッジ日時 | 2024-06-26 08:03:45 |
合計ジャッジ時間 | 2,787 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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ファイルパターン | 結果 |
---|---|
other | AC * 22 |
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
using System; using System.Linq; namespace No94{ public class Program{ public static void Main(string[] args){ var sr = new StreamReader(); //--------------------------------- var N = sr.Next<int>(); var R = sr.Next<int>(N, 2).Select(a => new{X = a[0], Y = a[1]}).ToArray(); Func<int, int, int, int, double> dist = (x1, y1, x2, y2) => Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); var uf = new UnionFind(N); for(var i = 0; i < N; i++){ for(var j = i + 1; j < N; j++){ if(dist(R[i].X, R[i].Y, R[j].X, R[j].Y) <= 10.0) uf.Unite(i, j); } } var res = 1.0 + Math.Sign(N); for(var i = 0; i < N; i++){ for(var j = i + 1; j < N; j++){ if(uf.IsSameSet(i, j)) res = Math.Max(res, 2.0 + dist(R[i].X, R[i].Y, R[j].X, R[j].Y)); } } Console.WriteLine(res); //--------------------------------- } } public class Ex{ public static void Swap<T>(ref T left, ref T right){ var tmp = left; left = right; right = tmp; } } public class UnionFind{ private readonly int[] _rank; private readonly int[] _p; public UnionFind(int size){ _rank = new int[size]; _p = new int[size]; for(var i = 0; i < size; i++){ _rank[i] = 0; _p[i] = i; } } public void Unite(int x, int y){ x = FindSet(x); y = FindSet(y); if(_rank[x] > _rank[y]) _p[y] = x; if(_rank[x] < _rank[y]) _p[x] = y; if(_rank[x] == _rank[y]){ _p[x] = y; _rank[y]++; } } public bool IsSameSet(int x, int y){ return FindSet(x) == FindSet(y); } public int FindSet(int x){ if(_p[x] == x) return x; return _p[x] = FindSet(_p[x]); } } public class StreamReader{ private readonly char[] _c = {' '}; private int _index = -1; private string[] _input = new string[0]; private readonly System.IO.StreamReader _sr = new System.IO.StreamReader(Console.OpenStandardInput()); public T Next<T>(){ if(_index == _input.Length - 1){ _index = -1; while(true){ string rl = _sr.ReadLine(); if(rl == null){ if(typeof(T).IsClass) return default(T); return (T)typeof(T).GetField("MinValue").GetValue(null); } if(rl != ""){ _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries); break; } } } return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture); } public T[] Next<T>(int x){ var ret = new T[x]; for(var i = 0; i < x; ++i) ret[i] = Next<T>(); return ret; } public T[][] Next<T>(int y, int x){ var ret = new T[y][]; for(var i = 0; i < y; ++i) ret[i] = Next<T>(x); return ret; } } }