結果
| 問題 |
No.157 2つの空洞
|
| コンテスト | |
| ユーザー |
t8m8⛄️
|
| 提出日時 | 2015-03-30 18:41:24 |
| 言語 | Java (openjdk 23) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 5,087 bytes |
| コンパイル時間 | 3,435 ms |
| コンパイル使用メモリ | 78,820 KB |
| 実行使用メモリ | 37,676 KB |
| 最終ジャッジ日時 | 2024-07-03 22:57:23 |
| 合計ジャッジ時間 | 5,381 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 WA * 1 |
| other | AC * 6 WA * 10 |
ソースコード
//No.157 2つの空洞
import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;
public class No157 {
static final InputStream in = System.in;
static final PrintWriter out = new PrintWriter(System.out,false);
static void solve(){
w = nextInt();
h = nextInt();
cs = new char[h][w];
for (int i=0; i<h; i++) {
cs[i] = next().toCharArray();
}
visited = new BitSet(w*h);
visited2 = new BitSet(w*h);
outer:
for (int i=0; i<h; i++) {
for (int j=0; j<w; j++) {
if (cs[i][j] == '.') {
dfs(i,j);
break outer;
}
}
}
int ans = Integer.MAX_VALUE;
for (int i=0; i<h; i++) {
for (int j=0; j<w; j++) {
if (visited.get(i*w+j)) {
ans = min(ans,dfs(i,j,0));
visited2.clear();
}
}
}
out.println(ans);
}
static int w,h;
static int[] dy = {0,0,1,-1};
static int[] dx = {1,-1,0,0};
static char[][] cs;
static BitSet visited, visited2;
static void dfs(int y, int x) {
visited.set(y*w+x);
for (int i=0; i<4; i++) {
int ny = y + dy[i];
int nx = x + dx[i];
if (ny < 0 || h <= ny || nx < 0 || w <= nx) continue;
if (!visited.get(ny*w+nx) && cs[ny][nx] == '.') {
dfs(ny,nx);
}
}
}
static int dfs(int y, int x, int depth) {
visited2.set(y*w+x);
int res = Integer.MAX_VALUE;
for (int i=0; i<4; i++) {
int ny = y + dy[i];
int nx = x + dx[i];
if (ny < 0 || h <= ny || nx < 0 || w <= nx) continue;
if (!visited.get(ny*w+nx) && cs[ny][nx] == '.') {
return depth;
}else if (!visited2.get(ny*w+nx) && cs[ny][nx] == '#') {
res = min(res,dfs(ny,nx,depth+1));
}
}
return res;
}
public static void main(String[] args) throws Exception {
long start = System.currentTimeMillis();
solve();
out.flush();
long end = System.currentTimeMillis();
//trace(end-start + "ms");
in.close();
}
static void trace(Object... o) { System.out.println(deepToString(o));}
static final byte[] buf = new byte[1024];
static int ptr = 0;
static int buflen = 0;
static boolean hasNextByte() {
if (ptr < buflen)
return true;
ptr = 0;
try{
buflen = in.read(buf);
}catch (IOException e) {e.printStackTrace();}
if (buflen <= 0)
return false;
return true;
}
static int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}
static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
static void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}
static boolean hasNext() {skip(); return hasNextByte();}
static String next() {
if (!hasNext()) throw new NoSuchElementException();
StringBuilder sb = new StringBuilder();
int b = readByte();
while (isPrintableChar(b)) {
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
static long nextLong() {
if (!hasNext()) throw new NoSuchElementException();
boolean minus = false;
long num = readByte();
if(num == '-'){
num = 0;
minus = true;
}else if (num < '0' || '9' < num){
throw new NumberFormatException();
}else{
num -= '0';
}
while(true){
int b = readByte();
if('0' <= b && b <= '9')
num = num * 10 + (b - '0');
else if(b == -1 || !isPrintableChar(b))
return minus ? -num : num;
else
throw new NoSuchElementException();
}
}
static int nextInt() {
long num = nextLong();
if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
throw new NumberFormatException();
return (int)num;
}
static double nextDouble() {
return Double.parseDouble(next());
}
static char nextChar() {
if (!hasNext()) throw new NoSuchElementException();
return (char)readByte();
}
static String nextLine() {
while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
if (!hasNextByte()) throw new NoSuchElementException();
StringBuilder sb = new StringBuilder();
int b = readByte();
while (b != '\n' && b != '\r') {
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
static int[] nextArrayInt(int n) {
int[] a = new int[n];
for (int i=0; i<n; i++) a[i] = nextInt();
return a;
}
}
t8m8⛄️