HDU 1240 Asteroids!(BFS)

#include<cstdio>
#include<cstring>
#include<queue>
using namespace std;
const int maxn=15;
int dr[]={-1,1,0,0,0,0};//前后左右上下
int dc[]={0,0,-1,1,0,0};
int dh[]={0,0,0,0,-1,1};
bool vis[maxn][maxn][maxn];
int dist[maxn][maxn][maxn];                        //之前把dist也定义成了bool变量
char map[maxn][maxn][maxn];
struct Node
{
    int r,c,h;
    Node(int r,int c,int h):r(r),c(c),h(h){}
};
int n;
int r1,c1,h1,r2,c2,h2;
int BFS()
{
    queue<Node> Q;
    memset(vis,0,sizeof(vis));
    dist[r1][c1][h1]=0;
    vis[r1][c1][h1]=true;
    if(r1==r2&&c1==c2&&h1==h2) return 0;
    Q.push(Node(r1,c1,h1));
    while(!Q.empty())
    {
        Node node=Q.front();Q.pop();
        int r=node.r,c=node.c,h=node.h;
        for(int d=0;d<6;d++)                    //错误,先前写成了d<4了
        {
            int nr=r+dr[d],nc=c+dc[d],nh=h+dh[d];
            if(nr>=0&&nr<n&&nc>=0&&nc<n&&nh>=0&&nh<n&&!vis[nr][nc][nh]&&map[nh][nr][nc]=='O')
            {
                vis[nr][nc][nh]=true;
                dist[nr][nc][nh]=dist[r][c][h]+1;
                Q.push(Node(nr,nc,nh));
                if(nr==r2&&nc==c2&&nh==h2) return dist[nr][nc][nh];
            }
        }
    }
    return -1;
}
int main()
{
    char str[100];
    while(scanf("%s%d",str,&n)==2)
    {
        for(int h=0;h<n;h++)
            for(int r=0;r<n;r++)
                scanf("%s",map[h][r]);
        scanf("%d%d%d%d%d%d",&c1,&r1,&h1,&c2,&r2,&h2);
        scanf("%s",str);
        int ans=BFS();
        if(ans==-1) printf("NO ROUTE\n");
        else printf("%d %d\n",n,ans);
    }
    return 0;
}