@[zhangjingcan](/user/219661) 本人经常眼瞎
by ⚡zhangjingcan⚡ @ 2020-08-30 17:13:24
`a[px][py] > -1`什么鬼？
by Purslane @ 2020-08-30 20:22:17
@[zhangjingcan](/user/219661)
by Purslane @ 2020-08-30 20:22:29
为什么要按照老师模板写呢？我喜欢手写双队列……
by Purslane @ 2020-08-30 20:26:57
看我清奇的马蜂
```cpp
#include<bits/stdc++.h>
using namespace std;
inline bool id(const char ch) {
return ch>='0'&&ch<='9';
}
inline int read(void) {
int s=0;
char ch=getchar();
while(!id(ch)) ch=getchar();
while(id(ch)) s=(s<<1)+(s<<3)+(ch^48),ch=getchar();
return s;
}
const int MAXN=1000+10;
int n,h,t,sx,sy,ex,ey,x[MAXN*MAXN],y[MAXN*MAXN],st[MAXN][MAXN],step[MAXN*MAXN];
const int dx[5]={0,1,-1,0,0},dy[5]={0,0,0,1,-1};
void bfs() {
h=1;
x[++t]=sx,y[t]=sy;
while(h<=t) {
int tmpx=x[h],tmpy=y[h++];
for(int i=1;i<=4;i++) {
int xx=tmpx+dx[i],yy=tmpy+dy[i];
if(!st[xx][yy]) continue;
st[xx][yy]=0;
x[++t]=xx,y[t]=yy,step[t]=step[h-1]+1;
if(xx==ex&&yy==ey) {
printf("%d",step[t]);
exit(0);
}
}
}
}
int main() {
n=read();
for(int i=1;i<=n;i++) {
string tmp;
cin>>tmp;
for(int j=0;j<n;j++) if(tmp[j]=='0') st[i][j+1]=1;
}
sx=read(),sy=read(),ex=read(),ey=read();
bfs();
printf("Chuxu AK IOI!!!");
return 0;
}
```
by Purslane @ 2020-08-30 20:37:57