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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4.  
  5. public class Main {
  6.     static int L, N;
  7.     static int[] alpa_map;
  8.     static int[][] map;
  9.     static int[] ax = {-1, 1, 0, 0};
  10.     static int[] ay = {0, 0, -1, 1};
  11.     static int answer = 0;
  12.     static int max = 0;
  13.     public static void main(String[] args) throws IOException {
  14.     	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  15.  
  16.     	String[] n_arr = br.readLine().split(" ");
  17.  
  18.     	L = Integer.parseInt(n_arr[0]);
  19.     	N = Integer.parseInt(n_arr[1]);
  20.  
  21.     	map = new int[L][N];
  22.  
  23.     	alpa_map = new int[26];
  24.  
  25.     	for(int i = 0; i<L; i++) {
  26.     		String input = br.readLine();
  27.     		for(int j = 0; j<N; j++) {
  28.     			map[i][j] = (int)input.charAt(j) - 'A';
  29.     		}
  30.     	}
  31.  
  32.     	//alpa_map[map[0][0]] = 1;
  33.  
  34.     	answer++;
  35.  
  36.     	dfs(0, 0);
  37.  
  38.     	System.out.println(max);
  39.     }
  40.  
  41.     static void dfs(int i, int j) {
  42.     	alpa_map[map[i][j]] = 1;
  43.     	for(int a = 0; a<4; a++) {
  44.     		int nx = i + ax[a];
  45.     		int ny = j + ay[a];
  46.  
  47.     		if(nx >= 0 && ny >= 0 && nx < L && ny < N) {
  48.     			if(alpa_map[map[nx][ny]] == 0) {
  49.     				alpa_map[map[nx][ny]] = 1;
  50.     				answer++;
  51.     				if(max < answer) {
  52.     					max = answer;
  53.     				}
  54.     				dfs(nx, ny);
  55.     			}
  56.     		}
  57.     	}
  58.  
  59.     	answer--;
  60. 		alpa_map[map[i][j]] = 0;
  61.     }
  62. }
  63.  
  64.  
Success #stdin #stdout 0.05s 2184192KB
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https://ideone.com/JtqU2G
language:
Java (12.0.1)
created:
5 years ago
visibility:
public

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