結果
| 問題 | No.168 ものさし |
| コンテスト | |
| ユーザー |
eitaho
|
| 提出日時 | 2015-03-20 02:14:17 |
| 言語 | C#(csc) (csc 3.9.0) |
| 結果 |
AC
|
| 実行時間 | 255 ms / 2,000 ms |
| コード長 | 4,215 bytes |
| 記録 | |
| コンパイル時間 | 2,031 ms |
| コンパイル使用メモリ | 111,616 KB |
| 実行使用メモリ | 31,104 KB |
| 最終ジャッジ日時 | 2024-12-24 07:01:56 |
| 合計ジャッジ時間 | 3,939 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 19 |
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.IO;
using System.Linq;
using System.Text;
using System.Diagnostics;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using Enu = System.Linq.Enumerable;
class Program
{
void Solve()
{
int N = reader.Int();
var P = reader.IntGrid(N);
var Es = new List<Edge>();
Func<long, long> Sq = n => n * n;
Func<int, int, int> Cost = (a, b) =>
{
long sq = Sq(P[a][0] - P[b][0]) + Sq(P[a][1] - P[b][1]);
long len = (long)Math.Sqrt(sq) / 10 * 10;
for (; ; len += 10) if (len * len >= sq) return (int)len;
};
for (int a = 0; a < N; a++)
for (int b = 0; b < a; b++)
Es.Add(new Edge(a, b, Cost(a, b)));
Es.Sort();
var uf = new UnionFind(N);
int ans = 0;
foreach (var e in Es)
if (uf.Unite(e.a, e.b) && uf.Same(0, N - 1))
{
ans = e.cost;
break;
}
Console.WriteLine(ans);
}
struct Edge : IComparable<Edge>
{
public int a, b;
public int cost;
public Edge(int a, int b, int c)
{
this.a = a; this.b = b; this.cost = c;
}
public int CompareTo(Edge other)
{
return cost.CompareTo(other.cost);
}
}
class UnionFind
{
private int[] parent;
private int[] rank;
private int[] numElements;
public UnionFind(int N)
{
parent = new int[N];
rank = new int[N];
numElements = new int[N];
for (int i = 0; i < N; i++)
{
parent[i] = i;
numElements[i] = 1;
}
}
public int Root(int x)
{
if (parent[x] == x) return x;
return parent[x] = Root(parent[x]);
}
public bool Same(int x, int y)
{
return Root(x) == Root(y);
}
public int NumElements(int x)
{
return numElements[Root(x)];
}
public bool Unite(int x, int y)
{
x = Root(x); y = Root(y);
if (x == y) return false;
if (rank[x] < rank[y])
{
parent[x] = y;
numElements[y] += numElements[x];
}
else
{
parent[y] = x;
if (rank[x] == rank[y]) { rank[x]++; }
numElements[x] += numElements[y];
}
return true;
}
}
Reader reader = new Reader(Console.In);
static void Main() { new Program().Solve(); }
}
class Reader
{
private readonly TextReader reader;
private readonly char[] separator = { ' ' };
private readonly StringSplitOptions removeOp = StringSplitOptions.RemoveEmptyEntries;
private string[] A = new string[0];
private int i;
public Reader(TextReader r) { reader = r; }
public Reader(string file) { reader = new StreamReader(file); }
public bool HasNext() { return Enqueue(); }
public string String() { return Dequeue(); }
public int Int() { return int.Parse(Dequeue()); }
public long Long() { return long.Parse(Dequeue()); }
public double Double() { return double.Parse(Dequeue()); }
public int[] IntLine() { var s = Line(); return s == "" ? new int[0] : Array.ConvertAll(Split(s), int.Parse); }
public int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
public int[][] IntGrid(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
public string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
public string Line() { return reader.ReadLine().Trim(); }
private string[] Split(string s) { return s.Split(separator, removeOp); }
private bool Enqueue()
{
if (i < A.Length) return true;
string line = reader.ReadLine();
if (line == null) return false;
if (line == "") return Enqueue();
A = Split(line);
i = 0;
return true;
}
private string Dequeue() { Enqueue(); return A[i++]; }
}
eitaho