NOJ 523题/杭电1253题 亡命逃窜

题目链接~~>

开始在杭电上做这题时先是超内存,然后是超时,剪枝了一下结果wrong了,最后参考了一下才AC;

代码:

#include<stdio.h>
#include<queue>
using namespace std;
int a[50][50][50],n,m,u,D;
int dx[7]={1,-1,0,0,0,0},dy[7]={0,0,1,-1,0,0},dz[7]={0,0,0,0,1,-1};
struct zhang
{
    int x,y,z,time;
};
int bfs(int x,int y,int z)
{
    queue<zhang>q;
    zhang current,next;
    current.x=x;
    current.y=y;
    current.z=z;
    current.time=0;
    q.push(current);
    while(!q.empty())
    {
        current=q.front();
        q.pop();
        for(int i=0;i<6;i++)
           {
               next.x=current.x+dx[i];
               next.y=current.y+dy[i];
               next.z=current.z+dz[i];
               if(current.time+1<=D&&next.x>=0&&next.y>=0&&next.z>=0&&next.x<n&&next.y<m&&next.z<u&&!a[next.x][next.y][next.z])
               {
                   if(next.x==n-1&&next.y==m-1&&next.z==u-1)
                     {
                         return current.time+1;
                     }
                   next.time=current.time+1;
                   a[next.x][next.y][next.z]=1;
                   q.push(next);
               }
           }
    }
    return -1;
}
int main()
{
    int T,i,j,k;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d%d%d%d",&n,&m,&u,&D);
        for(i=0;i<n;i++)
          for(j=0;j<m;j++)
            for(k=0;k<u;k++)
              scanf("%d",&a[i][j][k]);
       printf("%d\n",bfs(0,0,0));

    }
    return 0;
}


 

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