143 lines
3.6 KiB
C++
143 lines
3.6 KiB
C++
#include <stdio.h>
|
|
#include <algorithm>
|
|
#include <string.h>
|
|
#include <iostream>
|
|
#include <map>
|
|
#include <vector>
|
|
#include <queue>
|
|
#include <set>
|
|
#include <string>
|
|
#include <math.h>
|
|
using namespace std;
|
|
char g[220][220];
|
|
int sx,sy,ex,ey;
|
|
int n,m;
|
|
int keynum;
|
|
int key_s[220][220];
|
|
int mo[][2] = {{0,1},{0,-1},{1,0},{-1,0}};
|
|
struct Node
|
|
{
|
|
int key;
|
|
int num;
|
|
int x,y;
|
|
};
|
|
queue<Node>q;
|
|
bool used[202][202][1<<7];
|
|
bool used2[202][202][1<<7][4];
|
|
int bfs()
|
|
{
|
|
while(!q.empty())q.pop();
|
|
Node tmp,now;
|
|
tmp.key = 0;
|
|
tmp.num = 0;
|
|
tmp.x = sx;
|
|
tmp.y = sy;
|
|
q.push(tmp);
|
|
memset(used,false,sizeof(used));
|
|
memset(used2,false,sizeof(used2));
|
|
used[sx][sy][0] = true;
|
|
while(!q.empty())
|
|
{
|
|
tmp = q.front();
|
|
q.pop();
|
|
for(int i = 0;i < 4;i++)
|
|
{
|
|
int mx = mo[i][0];
|
|
int my = mo[i][1];
|
|
int x = tmp.x;
|
|
int y = tmp.y;
|
|
int ss = tmp.key;
|
|
while(1)
|
|
{
|
|
if(g[x][y] =='L')
|
|
{
|
|
mx = 0; my = -1;
|
|
}
|
|
if(g[x][y] == 'U')
|
|
{
|
|
mx = -1;my = 0;
|
|
}
|
|
if(g[x][y] == 'D')
|
|
{
|
|
mx = 1;my = 0;
|
|
}
|
|
if(g[x][y] == 'R')
|
|
{
|
|
mx = 0; my = 1;
|
|
}
|
|
int dir;
|
|
if(mx==-1&&my==0)dir=0;
|
|
else if(mx==1&&my==0)dir=1;
|
|
else if(mx==0&&my==1)dir=2;
|
|
else if(mx==0&&my==-1)dir=3;
|
|
if(used2[x][y][ss][dir])break;
|
|
used2[x][y][ss][dir] = true;
|
|
x += mx;
|
|
y += my;
|
|
if(x < 0 || y < 0 || x >= n || y >= m)break;
|
|
if(g[x][y] =='#')break;
|
|
if( x == ex && y== ey && ss ==((1<<keynum)-1) )
|
|
return tmp.num+1;
|
|
if(g[x][y] =='L')
|
|
{
|
|
mx = 0; my = -1;
|
|
}
|
|
if(g[x][y] == 'U')
|
|
{
|
|
mx = -1;my = 0;
|
|
}
|
|
if(g[x][y] == 'D')
|
|
{
|
|
mx = 1;my = 0;
|
|
}
|
|
if(g[x][y] == 'R')
|
|
{
|
|
mx = 0; my = 1;
|
|
}
|
|
if(g[x][y] == 'K')
|
|
ss |= key_s[x][y];
|
|
if(x+mx >=0 && x+mx < n && y+my>=0 && y+my < m && g[x+mx][y+my]=='#')
|
|
{
|
|
if(used[x][y][ss])break;
|
|
now.x = x;now.y = y;
|
|
now.key = ss;
|
|
now.num = tmp.num + 1;
|
|
q.push(now);
|
|
used[x][y][ss] = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
int main()
|
|
{
|
|
while(scanf("%d%d",&n,&m)==2)
|
|
{
|
|
keynum = 0;
|
|
for(int i = 0;i < n;i++)
|
|
{
|
|
scanf("%s",g[i]);
|
|
for(int j = 0;j < m;j++)
|
|
{
|
|
if(g[i][j] == 'S')
|
|
{
|
|
sx = i;sy = j;
|
|
}
|
|
if(g[i][j] == 'E')
|
|
{
|
|
ex = i;ey = j;
|
|
}
|
|
if(g[i][j] == 'K')
|
|
{
|
|
key_s[i][j] = (1<<keynum);
|
|
keynum++;
|
|
}
|
|
}
|
|
}
|
|
printf("%d\n",bfs());
|
|
}
|
|
return 0;
|
|
}
|