题目：http://poj.org/problem?id=2251
简单三维 bfs不解释， 1A, 上代码
1 #include <iostream> 2 #include<cstdio> 3 #include<cstring> 4 #include<cstdlib> 5 #include<stack> 6 #include<queue> 7 #include<iomanip> 8 #include<cmath> 9 #include<map> 10 #include<vector> 11 #include<algorithm> 12 using namespace std; 13 14 int a,b,c; 15 int vis[50][50][50],G[50][50][50]; 16 int dx[6]={0,0,0,0,-1,1}; 17 int dy[6]={0,0,1,-1,0,0}; 18 int dz[6]={1,-1,0,0,0,0}; 19 struct node 20 { 21 int l,r,c,step; 22 }e,s,pos,next; 23 int bfs(int l,int r,int c) 24 { 25 int i; 26 queue<node>q; 27 next.l=l; next.r=r; next.c=c; next.step=0; 28 vis[l][r][c]=1; 29 q.push(next); 30 while(!q.empty()) 31 { 32 pos=q.front(); 33 q.pop(); 34 for(i=0; i<6; i++) 35 { 36 next.l=pos.l+dx[i]; next.r=pos.r+dy[i]; 37 next.c=pos.c+dz[i]; next.step=pos.step+1; 38 if(!vis[next.l][next.r][next.c]&&G[next.l][next.r][next.c]) 39 { 40 vis[next.l][next.r][next.c]=1; 41 q.push(next); 42 } 43 if(next.l==s.l&&next.r==s.r&&next.c==s.c) 44 return next.step; 45 } 46 } 47 return -1; 48 } 49 int main() 50 { 51 int i,j,k,x; 52 char ch; 53 while(cin>>a>>b>>c&&(a!=0||b!=0||c!=0)) 54 { 55 memset(G,0,sizeof(G)); 56 memset(vis,0,sizeof(vis)); 57 for(i=1; i<=a; i++) 58 for(j=1; j<=b; j++) 59 for(k=1; k<=c; k++) 60 { 61 cin>>ch; 62 if(ch=='.') 63 G[i][j][k]=1; 64 if(ch=='E') 65 { 66 e.l=i; e.r=j; e.c=k; 67 G[i][j][k]=1; 68 } 69 if(ch=='S') 70 { 71 s.l=i; s.r=j; s.c=k; 72 G[i][j][k]=1; 73 } 74 } 75 x=bfs(e.l,e.r,e.c); 76 if(x==-1) 77 cout<<"Trapped!"<<endl; 78 else 79 printf("Escaped in %d minute(s). ",x); 80 } 81 return 0; 82 }