BFS求最短路径

#include
#include
#include
#include
using namespace std;
int vis[81][81];
char map[81][81];
int next_Step[4][2]={{0,1},{1,0},{0,-1},{-1,0}};
struct point{
	int x;
	int y;
	int step;
};
int m,n;
int sx,sy,ex,ey;
queue q;
void bfs(){
	vis[sx][sy]=1;
	point p;
	p.x=sx;
	p.y=sy;
	p.step=0;
	q.push(p);
	while(!q.empty()){
		point temp;
		temp=q.front();
		q.pop();
		if(temp.x==ex && temp.y==ey){
			cout<=1 && nx<=m && ny>=1 && ny<=n && !vis[nx][ny] && map[nx][ny]!='#'){
				point pt;
				pt.x=nx;
				pt.y=ny;
				pt.step=temp.step+1;
				vis[nx][ny]=1;
				q.push(pt);
			}
		}
	}
}
int main(){
	memset(vis,0,sizeof(vis));
	freopen("in2.txt","r",stdin);
	while(~scanf("%d %d",&m,&n) && m!=0 && n!=0){
		for(int i=1;i<=m;i++){
			for(int j=1;j<=n;j++){
				cin>>map[i][j];
				if(map[i][j]=='S'){
					sx=i;
					sy=j;
				}
				if(map[i][j]=='G'){
					ex=i;
					ey=j;
				}
			}
		}
		bfs();
	}
	return 0;
} 

输入的话添加文件in2.txt

5 5
#S###
..##.
#.###
..###
..G##

输出最短路径为9，与》》》》》DFS实现迷宫，打印路径输出步数的图一样