글 읽기 - 맞는데 왜 틀리죠

rookel 5년 전 0

29%쯤에서 틀립니다.

#include <iostream>
#include <queue>
using namespace std;

queue<pair<int, int>> q;
queue<int> ql;
int M, N, D, c;
int map[1003][1003];
bool visited[1003][1003];
int dx[] = { -1, 1, 0, 0 };
int dy[] = { 0, 0, -1, 1 };
void bfs()
{
	while (!q.empty()) {
		int cx = q.front().first;
		int cy = q.front().second;
		D = ql.front();
		q.pop(); ql.pop();

		visited[cx][cy] = true;

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

			if (!visited[nx][ny] && map[nx][ny] == 0) {
				visited[nx][ny] = true;
				map[nx][ny] = 1;
				q.push(make_pair(nx, ny));
				ql.push(D + 1);
			}
		}
	}
}
int main()
{
	scanf("%d%d", &M, &N);
	for (int i = 0; i < 1001; i++) {
		for (int j = 0; j < 1001; j++) {
			map[i][j] = -1;
		}
	}
	for (int i = 1; i <= N; i++) {
		for (int j = 1; j <= M; j++) {
			scanf("%d", &map[i][j]);
			if (map[i][j] == 0) c++;
		}
	}

	for (int i = 1; i <= N; i++) {
		for (int j = 1; j <= M; j++) {
			if (map[i][j] == 1) {
				q.push(make_pair(i, j));
				ql.push(0);
			}
		}
	}

	bfs();

	for (int i = 1; i <= N; i++) {
		for (int j = 1; j <= M; j++) {
			if (map[i][j] == 0) {
				printf("-1");
				return 0;
			}
		}
	}
	printf("%d", D);
	return 0;
}