#45625 (Java21) No.157 2つの空洞

• 問題: No.157 2つの空洞
• ユーザー: holeguma
• 提出日時: 2015-08-26 00:10:20
• 言語: Java21 (openjdk 21)
• 結果: WA
• 実行時間: -
• コード長: 3,916 bytes
• コンパイル時間: 2,096 ms
• コンパイル使用メモリ: 85,992 KB
• 実行使用メモリ: 52,024 KB
• 最終ジャッジ日時: 2024-07-18 14:37:00
• 合計ジャッジ時間: 3,777 ms
• ジャッジサーバーID （参考情報）: judge3 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	49 ms; 37,364 KB
testcase_01	WA	-
testcase_02	WA	-
testcase_03	WA	-
testcase_04	AC	49 ms; 37,200 KB
testcase_05	AC	52 ms; 37,364 KB
testcase_06	WA	-
testcase_07	WA	-
testcase_08	AC	51 ms; 37,180 KB
testcase_09	AC	50 ms; 37,140 KB
testcase_10	WA	-
testcase_11	WA	-
testcase_12	WA	-
testcase_13	WA	-
testcase_14	AC	56 ms; 37,580 KB
testcase_15	AC	60 ms; 37,564 KB
testcase_16	AC	72 ms; 38,044 KB
testcase_17	AC	56 ms; 37,768 KB
testcase_18	WA	-
testcase_19	WA	-

ソースコード

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Comparator;
import java.util.Deque;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.Map;
import java.util.PriorityQueue;
import java.math.BigInteger;
    
public class Main{

static final InputStream in=System.in;
static final PrintWriter out=new PrintWriter(System.out);
static final int INF=Integer.MAX_VALUE/2;
static final long LINF=Long.MAX_VALUE/2;
static final int[] dx={1,0,-1,0};
static final int[] dy={0,1,0,-1};
static BitSet isCave1;

public static void main(String[] args) throws IOException{
InputReader ir=new InputReader(in);
int w=ir.nextInt();
int h=ir.nextInt();
int ans=INF;
char[][] map=new char[h][w];
int[][] dist=new int[h][w];
for(int i=0;i<h;i++){
map[i]=ir.next().toCharArray();
}
isCave1=new BitSet(w*h);
lo: for(int i=0;i<h;i++){
for(int j=0;j<w;j++){
if(map[i][j]=='.'){
dfs(i,j,map,w,h);
break lo;
}
}
}
for(int i=0;i<h;i++){
for(int j=0;j<w;j++){
if(isCave1.get(w*i+j)){
for(int k=0;k<4;k++){
int nx=i+dx[k];
int ny=j+dy[k];
if(!isCave1.get(nx*w+ny)) ans=Math.min(ans,bfs(nx,ny,map,dist,w,h));
}
}
}
}
out.println(ans);
out.flush();
}

public static void dfs(int x,int y,char[][] map,int w,int h){
isCave1.set(x*w+y);
for(int i=0;i<4;i++){
int nx=x+dx[i];
int ny=y+dy[i];
if(!isCave1.get(nx*w+ny)&&map[nx][ny]=='.') dfs(nx,ny,map,w,h);
}
}

public static int bfs(int sx,int sy,char[][] map,int[][] dist,int w,int h){
for(int i=0;i<h;i++) Arrays.fill(dist[i],INF);
Deque<Pair> que=new ArrayDeque<Pair>();
dist[sx][sy]=0;
que.offerLast(new Pair(sx,sy));
while(!que.isEmpty()){
Pair p=que.pollFirst();
int x=p.x;
int y=p.y;
for(int i=0;i<4;i++){
int nx=x+dx[i];
int ny=y+dy[i];
if(nx>=0&&nx<h&&ny>=0&&ny<w){
if(!isCave1.get(nx*w+ny)&&map[nx][ny]=='.') return dist[x][y]+1;
if(map[nx][ny]=='#'&&dist[nx][ny]>dist[x][y]+1){
que.offerLast(new Pair(nx,ny));
dist[nx][ny]=dist[x][y]+1;
}
}
}
}
return INF;
}

static class Pair{

public static int x;
public static int y;

public Pair(int x,int y){
this.x=x; this.y=y;
}

public static final Comparator<Pair> DISTANCE_ORDER=new Comp();
private static class Comp implements Comparator<Pair>{
public int compare(Pair p1,Pair p2){
return p1.x>p2.x?1:p1.x<p2.x?-1:0;
}
}

public String toString(){return "["+x+","+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;}
  
public int readByte() {
if(lenbuf==-1) throw new InputMismatchException();
if(curbuf>=lenbuf){
curbuf= 0;
try{
lenbuf=in.read(buffer);
}
catch (IOException e) {
throw new InputMismatchException();
}
if(lenbuf<=0)
return -1;
}
return buffer[curbuf++];
}

public boolean isSpaceChar(int c){return !(c>=33&&c<=126);}

private int skip() {int b; while((b = readByte())!=-1&&isSpaceChar(b)); return b;}

public String next() {
int b=skip();
StringBuilder sb=new StringBuilder();
while(!isSpaceChar(b)){
sb.appendCodePoint(b);
b=readByte();
}
return sb.toString();
}
 
public int nextInt() {
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() {
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 int[] toIntArray(int n){
int[] a=new int[n];
for(int i=0;i<n;i++) a[i]=nextInt();
return a;
}
}
}