UESTC_王之迷宫 2015 UESTC Training for Search Algorithm & String<Problem A>
A - 王之迷宫
Time Limit: 3000/1000MS (Java/Others) Memory Limit: 65535/65535KB (Java/Others)
王被困在了一个3维的迷宫中,他很想逃离这个迷宫回去当学霸,你能帮助他么? 由于王很仁慈,他悄悄地告诉你,本题读入迷宫的每一行时,要用scanf("%s"...) ......
Input
多组测试数据,对于每组测试数据,有三个整数 L,R,C(0<l,r,c≤30)。
L代表迷宫的高度,R和C分别代表每一层的行和列。
接下来是L个R×C的矩阵,矩阵包含4种字符(S,E,.,#),S代表王的初始位置,E代表出口,#代表障碍。.代表能通过的地方。
每一层之后有一个空行。
当L=R=C=0时,输入中断。
Output
如果可以逃离迷宫,按下列格式输出最短时间:
Escaped in x minute(s). (x表示逃离迷宫的最短时间, 走一步花费一昏钟)
否则,输出:
Trapped!
Sample input and output
| Sample Input | Sample Output |
|---|---|
3 4 5 |
Escaped in 11 minute(s). |
解题报告:
简单bfs,直接跑就完了
#include <iostream>
#include <cstring>
#include <cstdio>
#include <queue>
using namespace std;
char g[][][];
bool vis[][][];
int l,r,c;
int dir[][] = {-,,,,,,,-,,,,,,,-,,,};
typedef struct status
{
int x,y,z,step;
status(const int &x,const int &y,const int &z,const int &step)
{
this->x = x , this->y = y, this->z = z ,this->step = step;
}
}; queue<status>q;
int tarx,tary,tarz; bool judge(int x,int y,int z)
{
if (g[z][x][y] == '#' || x >= r || x < || y >= c || y < || z >= l || z < )
return false;
return true;
} int bfs()
{
while(!q.empty())
{
status ns = q.front();q.pop();
if (ns.x == tarx && ns.y == tary && ns.z == tarz)
return ns.step;
int x = ns.x , y = ns.y , z = ns.z , step = ns.step;
for(int i = ; i < ; ++ i)
{
int newx = x + dir[i][];
int newy = y + dir[i][];
int newz = z + dir[i][];
if(!judge(newx,newy,newz) || vis[newx][newy][newz])
continue;
vis[newx][newy][newz] = true;
q.push(status(newx,newy,newz,step+));
}
}
return -;
} int main(int argc,char *argv[])
{
while(scanf("%d%d%d",&l,&r,&c) && l )
{
for(int i = ; i < l ; ++ i)
for(int j = ; j < r ; ++ j)
scanf("%s",g[i][j]);
int stx,sty,stz;
for(int i = ; i < l ; ++ i)
for(int j = ; j < r ; ++ j)
for(int k = ; k < c ; ++ k)
{
if (g[i][j][k] == 'S')
stx = j,sty = k,stz = i;
if (g[i][j][k] == 'E')
tarx = j,tary = k , tarz = i;
}
while(!q.empty())
q.pop();
memset(vis,false,sizeof(vis));
vis[stx][sty][stz] = true;
q.push(status(stx,sty,stz,));
int ans = bfs();
if (ans != -)
printf("Escaped in %d minute(s).\n",ans);
else
printf("Trapped!\n");
}
return ;
}
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