```cpp
#include<bits/stdc++.h>
#define y1 laoqiu_tyxx
using namespace std;
struct pos
{
int x;
int y;
int step;
};
char a[1010][1010];
int n,i,j,x1,x2,y1,y2;
bool fl=false;
bool flag[1010][1010]={false};
int dx[]={1,0,-1,0},dy[]={0,1,0,-1};
queue<pos>q;
int main()
{
cin>>n;
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
{
cin>>a[i][j];
}
}
cin>>x1>>y1;
cin>>x2>>y2;
q.push({x1,y1,0});
flag[x1][y1]=true;
while(!q.empty())
{
for(i=0;i<4;i++)
{
int xx=q.front().x+dx[i];
int yy=q.front().y+dy[i];
int st=q.front().step+1;
if(a[xx][yy]=='0'&&((xx>=1&&xx<=n)&&(yy>=1&&yy<=n))&&!flag[xx][yy])
{
q.push({xx,yy,st});
flag[xx][yy]=true;
if(xx==x2&&yy==y2)
{
cout<<st;
return 0;
}
}
}
q.pop();
}
}
/*
3 5
.##.#
.#...
...#.
*/
```
by panxz2009 @ 2024-07-03 18:56:00
@[laoqiu_tyxx](/user/1301485) 你的 `st` 变量加了两遍
by panxz2009 @ 2024-07-03 18:57:02
？？？
这是怎么回事
by laoqiu_tyxx @ 2024-07-03 19:00:24
`y1` 不能作为变量名 @[laoqiu_tyxx](/user/1301485)
你可以像我一样把 `y1` 给 `define` 掉
by panxz2009 @ 2024-07-03 19:02:32
@[panxz2009](/user/169326)
还是超时
by laoqiu_tyxx @ 2024-07-03 19:05:30
？？
你的提交记录在哪 @[laoqiu_tyxx](/user/1301485)
by panxz2009 @ 2024-07-03 19:08:46
代码给我看下
by panxz2009 @ 2024-07-03 19:09:04
@panzx2009
我在本地测的，现在对了
by laoqiu_tyxx @ 2024-07-03 19:10:47
好吧
by panxz2009 @ 2024-07-03 19:11:28