学步园

#include<iostream>
#include<queue>
#include<cstring>
using namespace std;
int row,line,xx[4]={-1,1,0,0},yy[4]={0,0,-1,1};
char map[100][100];
bool vis[100][100];
struct node
{
	int x,y,step;
}st;
void init()
{
	int i,j;
	bool flag=1;
	for(i=0;i<row;i++)
		scanf("%s",map[i]);
	for(i=0;flag&&i<row;i++)
		for(j=0;flag&&j<line;j++)
			if(map[i][j]=='S')
			{
				st.x=i;
				st.y=j;
				st.step=0;
				flag=0;
			}
	memset(vis,0,sizeof(vis));
	vis[st.x][st.y]=1;
}
bool iscan(int x,int y)
{
	if(x<0||y<0||x>=row||y>=line||vis[x][y]||map[x][y]=='*')
		return 0;
	return 1;
}
void bfs()
{
	int i;
	queue<node>qq;
	node t1,t2;
	qq.push(st);
	while(qq.size())
	{
		t1=qq.front();
		qq.pop();
		if(map[t1.x][t1.y]=='T')
		{
			printf("%d\n",t1.step);
			return;
		}
		for(i=0;i<4;i++)
		{
			t2=t1;
			t2.x+=xx[i];
			t2.y+=yy[i];
			t2.step++;
			if(!iscan(t2.x,t2.y))
				continue;
			if(map[t2.x][t2.y]=='.'||map[t2.x][t2.y]=='T')
			{
				vis[t2.x][t2.y]=1;
				qq.push(t2);
			}
			else if((map[t2.x][t2.y]=='|'&&!(t1.step&1))||(map[t2.x][t2.y]=='-'&&(t1.step&1)))
			{
				if(i>1)
				{
					t2=t1;
					t2.step++;
					qq.push(t2);
					continue;
				}
				t2.x+=xx[i];
				if(!iscan(t2.x,t2.y))
					continue;
				vis[t2.x][t2.y]=1;
				qq.push(t2);
			}
			else
			{
				if(i<2)
				{
					t2=t1;
					t2.step++;
					qq.push(t2);
					continue;
				}
				t2.y+=yy[i];
				if(!iscan(t2.x,t2.y))
					continue;
				vis[t2.x][t2.y]=1;
				qq.push(t2);
			}
		}
	}
}
int main()
{
	while(scanf("%d%d",&row,&line)!=EOF)
	{
		init();
		bfs();
	}
}