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; }