[测试点数据](https://www.luogu.com.cn/record/102135055)
```
用例#1
5 6
###=##
#.W.##
#.####
#.@W##
######
输出
3
```
完全正确,但是跑洛谷判定全部RE
by XieLee @ 2023-02-14 17:19:11
输入的问题
不要直接用`bf.readLine()`
我给你改了一下输入，94分
```java
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StreamTokenizer;
import java.util.ArrayDeque;
import java.util.Queue;
public class Main {
static BufferedReader bf=new BufferedReader(new InputStreamReader(System.in));
static StreamTokenizer st =new StreamTokenizer(bf);
static int X;
static int Y;
static PrintWriter pw =new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
static char[][]a;
static boolean[][]vis;
static int []dx= {1,0,-1,0};
static int []dy= {0,1,0,-1};
static int sx,sy;
static Queue<Node>que=new ArrayDeque<>();
public static String nextLine() throws IOException{
String line = bf.readLine();
while(line.length()==0) line = bf.readLine();
return line;
}
public static void main(String[] args) throws IOException {
X=nextInt();
Y=nextInt();
a=new char[X][Y];
vis=new boolean[X][Y];
for(int i=0;i<X;i++)
{
String s=nextLine();
for(int j=0;j<s.length();j++)
{
a[i][j]=s.charAt(j);
if(a[i][j]=='@')
{
sx=i;sy=j;
}
}
}
que.add(new Node(sx,sy,0));
run();
pw.flush();
}
private static void run() {
while(!que.isEmpty())
{
Node node=que.peek();
que.remove();
if(a[node.x][node.y]=='=')
{
pw.print(node.t);
return;
}
if(a[node.x][node.y]>='A'&&a[node.x][node.y]<='Z')
{
node=go_anther(node.x,node.y,node.t);
}
for(int i=0;i<=3;i++)
{
int nx=node.x+dx[i];
int ny=node.y+dy[i];
if(nx>=0&&nx<X&&ny>=0&&ny<Y&&a[nx][ny]!='#'&&!vis[nx][ny])
{
vis[nx][ny]=true;
que.add(new Node(nx,ny,node.t+1));
}
}
}
}
private static Node go_anther(int nx, int ny, int t) {
for(int i=0;i<X;i++)
{
for(int j=0;j<Y;j++)
{
if(a[i][j]==a[nx][ny]&&(i!=nx||j!=ny))
{
return new Node(i,j,t);
}
}
}
return null;
}
static int nextInt() throws IOException {
st.nextToken();
return (int)st.nval;
}
}
class Node{
int x;
int y;
int t;
public Node(int x, int y, int t) {
super();
this.x = x;
this.y = y;
this.t = t;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY(){
return y;
}
public void setY(int y){
this.y = y;
}
public int getT() {
return t;
}
public void setT(int t) {
this.t = t;
}
}
```
by KKKZOZ @ 2023-02-14 17:46:18