Weekly-problems/satpix.java at master · tenyoung795/Weekly-problems · GitHub

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import java.io.*;
import java.util.ArrayList;
/*
ID: albert.9
LANG: JAVA
TASK: satpix
*/
public class satpix{
    //RECURSIVE
    private static int evaluate(String[][] grid, int row, int col, String from){
	    int ans;
	    if(row >= grid.length ||
	       row < 0 ||
	       col >= grid[0].length ||
	       col < 0)
		ans = 0;
	    else if(grid[row][col].equals(".")) ans = 0;
	    else{//grid[row][col].equals("*")
		grid[row][col] = ".";
		ans = 1;
		if(from.equals("")){
		    ans += evaluate(grid, row + 1, col, "top") +
			evaluate(grid, row - 1, col, "bottom") +
			evaluate(grid, row, col + 1, "left") +
			evaluate(grid, row, col - 1, "right");
		}
		else if(from.equals("top")){
		    ans += evaluate(grid, row + 1, col, "top") +
			evaluate(grid, row, col + 1, "left") +
			evaluate(grid, row, col - 1, "right");
		}
		else if(from.equals("bottom")){
		    ans += evaluate(grid, row - 1, col, "bottom") +
			evaluate(grid, row, col + 1, "left") +
			evaluate(grid, row, col - 1, "right");
		}
		else if(from.equals("left")){
		    ans += evaluate(grid, row + 1, col, "top") +
			evaluate(grid, row - 1, col, "bottom") +
			evaluate(grid, row, col + 1, "left");
		}
		else{
		    ans += evaluate(grid, row + 1, col, "top") +
			evaluate(grid, row - 1, col, "bottom") +
			evaluate(grid, row, col - 1, "right");
		}
	    }
	    return ans;
    }
    private static int findMax(ArrayList<Integer> list){
	int ans = 0;
	if(! list.isEmpty()){
	    for(int x: list){
		if(x > ans)
		    ans = x;
	    }
	}
	return ans;
    }
    public static void main(String[] args) throws IOException{
	BufferedReader f = new BufferedReader(new FileReader("satpix.in"));
	PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("satpix.out")));
	String[] nums = f.readLine().split(" ");
	int w = Integer.parseInt(nums[0]);
	int h = Integer.parseInt(nums[1]);
	String[][] grid = new String[h][w];
	String temp = "";
	for(int i = 0; i < h; i++){
	    temp = f.readLine();
	    for(int j = 0; j < w; j++){
		grid[i][j] = temp.substring(j,j+1);

	    }

	}
	ArrayList<Integer> sizes = new ArrayList<Integer>();
	for(int i = 0; i < h; i++){
	    for(int j = 0; j < w; j++){
		if(grid[i][j].equals("*")){
		    sizes.add(evaluate(grid, i, j, ""));
		}
	    }
	}
	int ans = findMax(sizes);
	out.println(ans);
	out.close();
	System.exit(0);
    }
}