-1
在8谜题中,当它找到板子中的空白瓷砖(用0表示)时,它需要一次移动可以到达的所有相邻板子。如何简化在8拼图中移动拼贴的代码?
因为我在我的实现中将二维板映射到一维数组,所以在我的代码中使用index()
确实有意义。
我无法弄清楚现在实施neighbors()
的优雅方式,因此它现在涉及到相当多的冗余代码。
public class Board {
private char[] tiles;
private int N;
private Board(char[] blocks) {
N = (int) Math.sqrt(blocks.length);
this.tiles = new char[blocks.length];
System.arraycopy(blocks, 0, this.tiles, 0, N * N);
}
private void exch(int i, int j) {
char swap = tiles[i];
tiles[i] = tiles[j];
tiles[j] = swap;
}
public Iterable<Board> neighbors()
{
Stack<Board> neighbors = new Stack<>();
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
if (tiles[index(i, j)] == 0) {
Board neighbor;
if (i > 0) {
neighbor = new Board(tiles);
neighbor.exch(index(i, j), index(i - 1, j));
neighbors.push(neighbor);
}
if (j > 0) {
neighbor = new Board(tiles);
neighbor.exch(index(i, j), index(i, j - 1));
neighbors.push(neighbor);
}
if (i < N - 1) {
neighbor = new Board(tiles);
neighbor.exch(index(i, j), index(i + 1, j));
neighbors.push(neighbor);
}
if (j < N - 1) {
neighbor = new Board(tiles);
neighbor.exch(index(i, j), index(i, j + 1));
neighbors.push(neighbor);
}
break;
}
}
}
return neighbors;
}
}
这似乎是可能更适合于[代码审查SE(http://codereview.stackexchange.com/)网络的一个问题? –
我投票结束这个问题,因为它是一个代码审查的请求。 – Raedwald