Submission #410865

#	Time	Username	Problem	Language	Result	Execution time	Memory
410865		GhOsT16790	Tracks in the Snow (BOI13_tracks)	Java	Compilation error	0 ms	0 KiB

tracks

import java.util.*;
import java.io.*;

public class boi2013 {
    static final int[] dx = {0, 0, -1, 1};
    static final int[] dy = {-1, 1, 0, 0};
    static int N = 1, H, W;
    static int[][] grid;
    static boolean[][] vist;
    public static void main(String[] args) throws IOException {
        Kattio io = new Kattio();

        H = io.nextInt();
        W = io.nextInt();
        grid = new int[H][W];

        for (int i = 0; i < H; i++) {
            String line = io.next();
            for (int j = 0; j < W; j++) {
                grid[i][j] = (line.charAt(j) == 'F')?1:(line.charAt(j) == 'R')?2:-1;
            }
        }

//        for(int[] row : grid) {
//            for (int col : row) {
//                System.out.print(col + "\t");
//            }
//            System.out.println();
//        }
//        System.out.println();

        bfs(0,0, grid[0][0]);

//        for(int[] row : grid) {
//            for (int col : row) {
//                System.out.print(col + "\t");
//            }
//            System.out.println();
//        }
//        System.out.println();

        for (int i = 0; i < H; i++) {
            for (int j = 0; j < W; j++) {
                if(grid[i][j] >= 1) {
                    bfs(i, j, grid[i][j]);
                    N++;
//                    for(int[] row : grid) {
//                        for (int col : row) {
//                            System.out.print(col + "\t");
//                        }
//                        System.out.println();
//                    }
//                    System.out.println();
                }
            }
        }

        io.println(N);
        io.close();
    }

    private static void bfs(int x, int y, int t) {
        vist = new boolean[H][W];

        Queue<Point> q = new LinkedList<>();
        q.add(new Point(x, y));
        vist[x][y] = true;

        while (!q.isEmpty()) {
            Point curr = q.poll();

            if(grid[curr.x][curr.y] >= 1) grid[curr.x][curr.y] = 0;

            for (int i = 0; i < 4; i++) {
                int nx = curr.x + dx[i];
                int ny = curr.y + dy[i];

                if(nx < 0 || ny < 0 || nx >= H || ny >= W) continue;
                if(vist[nx][ny]) continue;
                if(grid[nx][ny] == -1) continue;
                if(grid[nx][ny] != t && grid[nx][ny] != 0) continue;

                vist[nx][ny] = true;
                q.add(new Point(nx, ny));
            }
        }
    }

    private static class Point {
        int x, y;
        public Point(int a, int b) {
            x = a;
            y = b;
        }
        public String toString() {
            return x + " " + y;
        }
    }

    private static class Kattio extends PrintWriter {
        private BufferedReader r;
        private StringTokenizer st;

        // standard input
        public Kattio() { this(System.in,System.out); }
        public Kattio(InputStream i, OutputStream o) {
            super(o);
            r = new BufferedReader(new InputStreamReader(i));
        }
        // USACO-style file input
        public Kattio(String problemName) throws IOException {
            super(new FileWriter(problemName+".out"));
            r = new BufferedReader(new FileReader(problemName+".in"));
        }

        // returns null if no more input
        public String next() {
            try {
                while (st == null || !st.hasMoreTokens())
                    st = new StringTokenizer(r.readLine());
                return st.nextToken();
            } catch (Exception e) {}
            return null;
        }

        public int nextInt() { return Integer.parseInt(next()); }
        public double nextDouble() { return Double.parseDouble(next()); }
        public long nextLong() { return Long.parseLong(next()); }
    }
}

Compilation message (stderr)

tracks.java:4: error: class boi2013 is public, should be declared in a file named boi2013.java
public class boi2013 {
       ^
1 error