POJ 2251 Dungeon Master (BFS)

Dungeon Master

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 17264		Accepted: 6722

Description

You is trapped in a 3D dungeon and need to find the quickest-on-the-do out! The dungeon is composed of a unit cubes which may or may isn't being filled with rock. It takes one minute to move one unit north, south, east, west, up or down. You cannot move diagonally and the maze are surrounded by solid rock in all sides.

is an escape possible? If Yes, how long would it take?

Input

The input consists of a number of dungeons. Each of the dungeon description starts with a line containing three integers L, R and C (all limited to the size).
L is the number of levels making up the dungeon.
R and C is the number of rows and columns making up the plan of each level.
Then there'll follow L blocks of R lines each containing C characters. Each character describes one cell of the dungeon. A cell full of rock was indicated by a ' # ' and empty cells were represented by a '. Your starting position is indicated by ' S ' and the exit by the letter ' E '. There ' s a single blank line after each level. Input is terminated by three zeroes for L, R and C.

Output

Each maze generates one line of output. If It is possible to reach the exit, print a line of the form

escaped in x minute (s).

where x is replaced by the shortest time it takes to escape.
If it isn't possible to escape, print the line

trapped!

Sample Input

3 4 5s.....###. ##.. ###.#############.####...###########.###### #E1 3 3s## #E # # #0 0 0

Sample Output

Escaped in minute (s). trapped!

Source

Test instructions

Give you n multi-storey, ask S to e the minimum time.

Exercises

BFS is just adding up and down two search directions.

Code:

#include <iostream> #include <cstdio> #include <cstring> #include <cmath> #include <string > #include <algorithm> #include <cstdlib> #include <set> #include <queue> #include <stack > #include <vector> #include <map> #define N 100010#define Mod 10000007#define Lson l,mid,idx<<1#  Define Rson mid+1,r,idx<<1|1#define LC idx<<1#define RC Idx<<1|1const Double EPS = 1e-11;const double PI    = ACOs ( -1.0); typedef long long Ll;const int inf=1000010;using namespace std;struct node{int x, y, Z; int num;} Node S,e;int N,m,c,ans;char mp[33][33][33];bool vis[33][33][33];queue<node>a;int x[6]= { -1,0,1,0,0,0};int y[6]    = {0,1,0,-1,0,0};int z[6]= {0,0,0,0,1,-1};int bfs () {memset (vis,0,sizeof vis);    A.push (s);    Node T;        while (A.size ()) {T=a.front ();        Node TT;        A.pop ();        if (t.x==e.x&&t.y==e.y&&t.z==e.z) return t.num;        for (int i=0; i<6; i++) {    Tt.x=x[i]+t.x;            Tt.y=y[i]+t.y;            Tt.z=z[i]+t.z; if (tt.x>=0&&tt.x<c&&tt.y>=0&&tt.y<n&&tt.z<m&&tt.z>=0                &&!vis[tt.x][tt.y][tt.z]&&mp[tt.x][tt.y][tt.z]!= ' # ') {tt.num=t.num+1;                A.push (TT);            Vis[tt.x][tt.y][tt.z]=1; }}} return-1;}    int main () {//freopen ("test.in", "R", stdin);        while (cin>>c>>n>>m) {if (n==0&&m==0&&c==0) break;        GetChar (); for (int i=0, i<c; i++) {for (int j=0; j<n; J + +) {for (int k=0; k<m; k                    + +) {scanf ("%c", &mp[i][j][k]);                    if (mp[i][j][k]== ' S ') {s.x=i,s.y=j,s.z=k,s.num=0;                      } if (mp[i][j][k]== ' E ') {  E.x=i,e.y=j,e.z=k;            }} getchar ();        }} while (A.size ()) A.pop ();        int Num=bfs ();        if (num!=-1) printf ("escaped in%d minute (s). \ n", num);    else printf ("trapped!\n"); } return 0;}

POJ 2251 Dungeon Master (BFS)