結果

問題 No.94 圏外です。(EASY)
ユーザー holeguma
提出日時 2015-10-14 19:31:33
言語 Java
(openjdk 23)
結果
AC  
実行時間 175 ms / 5,000 ms
コード長 3,860 bytes
コンパイル時間 2,444 ms
コンパイル使用メモリ 81,912 KB
実行使用メモリ 41,460 KB
最終ジャッジ日時 2024-06-26 07:44:39
合計ジャッジ時間 6,536 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
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
other AC * 22
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

import java.io.InputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.awt.Point;
    
public class Main{
 
static PrintWriter out;
static InputReader ir;
static final int INF=Integer.MAX_VALUE;
static final long LINF=Long.MAX_VALUE;
 
static void solve(){
 int n=ir.nextInt();
 if(n==0){
  out.println(1); return;
 }
 Point[] ps=new Point[n];
 UnionFindTree uf=new UnionFindTree(n);
 for(int i=0;i<n;i++){
  ps[i]=new Point(ir.nextInt(),ir.nextInt());
 }
 for(int i=0;i<n;i++){
  for(int j=i+1;j<n;j++){
   if(ps[i].distanceSq(ps[j])<=100){
    uf.unite(i,j);
   }
  }
 }
 double ans=0;
 for(int i=0;i<n;i++){
  for(int j=i+1;j<n;j++){
   if(!uf.same(i,j)) continue;
   ans=Math.max(ans,ps[i].distance(ps[j]));
  }
 }
 ans+=2;
 out.printf("%.12f\n",ans);
}
 
public static void main(String[] args) throws Exception{
 ir=new InputReader(System.in);
 out=new PrintWriter(System.out);
 solve();
 out.flush();
}
static class UnionFindTree{
 private int[] par;
 private int[] rank;
 public UnionFindTree(int size){
  par=new int[size];
  rank=new int[size];
  for(int i=0;i<size;i++){
   par[i]=i;
   rank[i]=0;
  }
 }
 private int find(int x){
  if(par[x]==x) return x;
  else return par[x]=find(par[x]);
 }
 public void unite(int x,int y){
  x=find(x);
  y=find(y);
  if(x==y) return;
  else if(rank[x]>rank[y]) par[y]=x;
  else{
   par[x]=y;
   if(rank[x]==rank[y]) rank[y]++;
  }
 }
 public boolean same(int x,int y){
  return find(x)==find(y);
 }
}
static class InputReader {
 private InputStream in;
 private byte[] buffer=new byte[1024];
 private int curbuf;
 private int lenbuf;
 
 public InputReader(InputStream in) {this.in=in; this.curbuf=this.lenbuf=0;}
  
 public boolean hasNextByte() {
  if(curbuf>=lenbuf){
   curbuf= 0;
   try{
    lenbuf=in.read(buffer);
   }catch(IOException e) {
    throw new InputMismatchException();
   }
   if(lenbuf<=0) return false;
  }
  return true;
 }
 
 private int readByte(){if(hasNextByte()) return buffer[curbuf++]; else return -1;}
 
 private boolean isSpaceChar(int c){return !(c>=33&&c<=126);}
 
 private void skip(){while(hasNextByte()&&isSpaceChar(buffer[curbuf])) curbuf++;}
 
 public boolean hasNext(){skip(); return hasNextByte();}
 
 public String next(){
  if(!hasNext()) throw new NoSuchElementException();
  StringBuilder sb=new StringBuilder();
  int b=readByte();
  while(!isSpaceChar(b)){
   sb.appendCodePoint(b);
   b=readByte();
  }
  return sb.toString();
 }
 
 public int nextInt() {
  if(!hasNext()) throw new NoSuchElementException();
  int c=readByte();
  while (isSpaceChar(c)) c=readByte();
  boolean minus=false;
  if (c=='-') {
   minus=true;
   c=readByte();
  }
  int res=0;
  do{
   if(c<'0'||c>'9') throw new InputMismatchException();
   res=res*10+c-'0';
   c=readByte();
  }while(!isSpaceChar(c));
  return (minus)?-res:res;
 }
 
 public long nextLong() {
  if(!hasNext()) throw new NoSuchElementException();
  int c=readByte();
  while (isSpaceChar(c)) c=readByte();
  boolean minus=false;
  if (c=='-') {
   minus=true;
   c=readByte();
  }
  long res = 0;
  do{
   if(c<'0'||c>'9') throw new InputMismatchException();
   res=res*10+c-'0';
   c=readByte();
  }while(!isSpaceChar(c));
  return (minus)?-res:res;
 }
 
 public double nextDouble(){return Double.parseDouble(next());}
 
 public BigInteger nextBigInteger(){return new BigInteger(next());}
 
 public BigDecimal nextBigDecimal(){return new BigDecimal(next());}
 
 public int[] nextIntArray(int n){
  int[] a=new int[n];
  for(int i=0;i<n;i++) a[i]=nextInt();
  return a;
 }
 
 public char[][] nextCharMap(int n,int m){
  char[][] map=new char[n][m];
  for(int i=0;i<n;i++) map[i]=next().toCharArray();
  return map;
 }
}
}
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