結果

問題 No.402 最も海から遠い場所
ユーザー uwi
提出日時 2016-07-23 00:09:30
言語 Java
(openjdk 23)
結果
AC  
実行時間 1,720 ms / 3,000 ms
コード長 4,047 bytes
コンパイル時間 4,052 ms
コンパイル使用メモリ 85,768 KB
実行使用メモリ 395,392 KB
最終ジャッジ日時 2024-11-06 13:45:10
合計ジャッジ時間 13,455 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
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
sample AC * 3
other AC * 19
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

package contest;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Queue;
public class N402 {
    InputStream is;
    PrintWriter out;
    String INPUT = "";
    
    void solve()
    {
        int n = ni(), m = ni();
        char[][] map = nm(n,m);
        int[][] d = new int[n+2][m+2];
        for(int i = 0;i < n+2;i++){
            Arrays.fill(d[i], 99999999);
        }
        Queue<int[]> q = new ArrayDeque<>();
        for(int i = 0;i < n;i++){
            for(int j = 0;j < m;j++){
                if(map[i][j] == '.'){
                    q.add(new int[]{i+1, j+1});
                    d[i+1][j+1] = 0;
                }
            }
        }
        for(int i = 0;i < n+2;i++){
            q.add(new int[]{i, 0});
            d[i][0] = 0;
            q.add(new int[]{i, m+1});
            d[i][m+1] = 0;
        }
        for(int i = 0;i < m+2;i++){
            q.add(new int[]{0, i});
            d[0][i] = 0;
            q.add(new int[]{n+1, i});
            d[n+1][i] = 0;
        }
        int max = 0;
        while(!q.isEmpty()){
            int[] cur = q.poll();
            int r = cur[0], c = cur[1];
            max = Math.max(max, d[r][c]);
            for(int nr = r-1;nr <= r+1;nr++){
                for(int nc = c-1;nc <= c+1;nc++){
                    if(nr >= 0 && nr < n+2 && nc >= 0 && nc < m+2 && d[nr][nc] > d[r][c] + 1){
                        d[nr][nc] = d[r][c] + 1;
                        q.add(new int[]{nr, nc});
                    }
                }
            }
        }
        out.println(max);
    }
    
    void run() throws Exception
    {
        is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
        out = new PrintWriter(System.out);
        
        long s = System.currentTimeMillis();
        solve();
        out.flush();
        if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//      Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//          @Override
//          public void run() {
//              long s = System.currentTimeMillis();
//              solve();
//              out.flush();
//              if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//          }
//      };
//      t.start();
//      t.join();
    }
    
    public static void main(String[] args) throws Exception { new N402().run(); }
    
    private byte[] inbuf = new byte[1024];
    private int lenbuf = 0, ptrbuf = 0;
    
    private int readByte()
    {
        if(lenbuf == -1)throw new InputMismatchException();
        if(ptrbuf >= lenbuf){
            ptrbuf = 0;
            try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
            if(lenbuf <= 0)return -1;
        }
        return inbuf[ptrbuf++];
    }
    
    private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
    private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
    
    private double nd() { return Double.parseDouble(ns()); }
    private char nc() { return (char)skip(); }
    
    private String ns()
    {
        int b = skip();
        StringBuilder sb = new StringBuilder();
        while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    
    private char[] ns(int n)
    {
        char[] buf = new char[n];
        int b = skip(), p = 0;
        while(p < n && !(isSpaceChar(b))){
            buf[p++] = (char)b;
            b = readByte();
        }
        return n == p ? buf : Arrays.copyOf(buf, p);
    }
    
    private int[] na(int n)
    {
        int[] a = new int[n];
        for(int i = 0;i < n;i++)a[i] = ni();
        return a;
    }
    
    private long[] nal(int n)
    {
        long[] a = new long[n];
        for(int i = 0;i < n;i++)a[i] = nl();
        return a;
    }
    
    private char[][] nm(int n, int m) {
        char[][] map = new char[n][];
        for(int i = 0;i < n;i++)map[i] = ns(m);
        return map;
    }
    
    private int[][] nmi(int n, int m) {
        int[][] map = new int[n][];
        for(int i = 0;i < n;i++)map[i] = na(m);
        return map;
    }
    
    private int ni() { return (int)nl(); }
    
    private long nl()
    {
        long num = 0;
        int b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}
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