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Main1987.java
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Main1987.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main1987 {
static char[][] map;
static boolean[] en = new boolean[26];
static int[] dx = {-1,0,1,0};
static int[] dy = {0,-1,0,1};
static int R,C,max = 0;
public static void main(String[] args) throws NumberFormatException, IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
R = Integer.parseInt(st.nextToken());
C = Integer.parseInt(st.nextToken());
map = new char[R][C];
for(int i=0;i<R;i++) {
map[i] = br.readLine().toCharArray();
}
int x = 0;
int y = 0;
en[map[x][y]-'A'] = true;
dfs(x,y,1);
System.out.println(max);
}
static void dfs(int x, int y ,int cnt) {
if(max==R*C) {
return;
}
for(int i=0;i<4;i++) {
int nx = x + dx[i];
int ny = y + dy[i];
if(nx >=0 && ny>=0 && nx<R && ny<C) {
if(!en[map[nx][ny] -'A']) {
en[map[nx][ny]-'A']=true;
dfs(nx,ny,cnt+1);
en[map[nx][ny] -'A'] =false;
}
}
}
max = cnt>max? cnt :max;
}
}