Created
May 12, 2017 14:45
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정올,bfs,2613, 토마토
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| import java.util.LinkedList; | |
| import java.util.Queue; | |
| import java.util.Scanner; | |
| /** | |
| * 정올, bfs, 2613 | |
| * 토마토 | |
| * @author whitebeard-k | |
| * | |
| */ | |
| public class Problem2613 { | |
| public static void main(String[] args) { | |
| Queue<int[]> queue = new LinkedList<>(); | |
| Scanner sc = new Scanner(System.in); | |
| int y = sc.nextInt() + 1; | |
| int x = sc.nextInt() + 1; | |
| int[][] array = new int[x][y]; | |
| for (int i = 1; i < x; i++) { | |
| for (int k = 1; k < y; k++) { | |
| array[i][k] = sc.nextInt(); | |
| if (array[i][k] == 1) { | |
| queue.add(new int[] { i, k }); | |
| } | |
| } | |
| } | |
| sc.close(); | |
| bfs(queue, array); | |
| // 남은 토마토가 있는지 확인 | |
| for (int i = 1; i < x; i++) | |
| for (int k = 1; k < y; k++) | |
| if (array[i][k] == 0) { | |
| System.out.println(-1); | |
| System.exit(0); | |
| } | |
| System.out.println(count - 1); | |
| } | |
| // 상하좌우 이동을 위한 배열 | |
| static int[][] moves = { { -1, 0 }, { 1, 0 }, { 0, -1 }, { 0, 1 } }; | |
| static int count = 1; | |
| public static void bfs(Queue<int[]> queue, int[][] array) { | |
| while (!queue.isEmpty()) { | |
| int size = queue.size(); | |
| while (size-- > 0) { | |
| int[] current = queue.poll(); | |
| for (int[] move : moves) { | |
| int x = current[0] + move[0]; | |
| int y = current[1] + move[1]; | |
| // 이동이 가능한지 확인하고, 가능하면 큐에 입력 | |
| if (0 < x && x < array.length && 0 < y && y < array[0].length && array[x][y] == 0) { | |
| queue.add(new int[] { x, y }); | |
| array[x][y] = count; | |
| } | |
| } | |
| } | |
| if (!queue.isEmpty()) | |
| count++; | |
| } | |
| } | |
| } |
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