Submission #438918

#	Time	Username	Problem	Language	Result	Execution time	Memory
438918		coderInTraining	Tracks in the Snow (BOI13_tracks)	Java	Compilation error	0 ms	0 KiB

tracks

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

class tracks {
	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, count;
	public static void main(String[] args) {
		FastIO io = new FastIO();

		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;
			}
		}

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

	private static int bfs() {
		count = new int[H][W];

		LinkedList<int[]> q = new LinkedList<>();
		q.add(new int[]{0,0});
		count[0][0] = 1;

		while (!q.isEmpty()) {
			int[] curr = q.poll();

			N = Math.max(N, count[curr[0]][curr[1]]);

			for (int i = 0; i < 4; i++) {
				int nx = curr[0] + dx[i];
				int ny = curr[1] + dy[i];

				if(nx < 0 || ny < 0 || nx >= H || ny >= W) continue;
				if(count[nx][ny] > 0) continue;
				if(grid[nx][ny] == -1) continue;
				if(grid[nx][ny] != grid[curr[0]][curr[1]]) {
					count[nx][ny] = count[curr[0]][curr[1]] + 1;
					q.addLast(new int[]{nx, ny});
				}
				else {
					count[nx][ny] = count[curr[0]][curr[1]];
					q.addFirst(new int[]{nx, ny});
				}
			}
		}

		return N;
	}

	//Code Snippet: FastIO (Click to expand)
}

Compilation message (stderr)

tracks.java:10: error: cannot find symbol
		FastIO io = new FastIO();
		^
  symbol:   class FastIO
  location: class tracks
tracks.java:10: error: cannot find symbol
		FastIO io = new FastIO();
		                ^
  symbol:   class FastIO
  location: class tracks
2 errors