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#include <iostream>
#include <cstdio>
using namespace std;
struct note{
int x;
int y;
int s,f;
} que[2501];
int head,tail,n,m,startx,starty,p,q,tx,ty,flag;
int a[51][51];
bool book[51][51];
int next[4][2]={{0,1},{1,0},{0,-1},{-1,0}};
int main()
{
scanf("%d %d",&n,&m);
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++) scanf("%d",&a[i][j]);
}
scanf("%d%d%d%d",&startx,&starty,&p,&q);
head=1; tail=1;
que[tail].x=startx;
que[tail].y=starty;
que[tail].f=0;
que[tail].s=0;
tail++;
book[startx][starty]=1;
flag=0;
while(head<tail){
for(int k=0;k<=3;k++){
tx=que[head].x+next[k][0];
ty=que[head].y+next[k][1];
if(tx==p&&ty==q){
flag=1;
break;
}
if(tx<1||tx>n||ty<1||ty>m) continue;
if(a[tx][ty]&&book[tx][ty]) continue;
book[tx][ty]=true;
que[tail].x=tx;
que[tail].y=ty;
que[tail].f=head;
que[tail].s=que[head].s+1;
tail++;
}
if(flag==1) break;
head++;
}
printf("%d",que[tail-1].s);
return 0;
}
Dev上运行的好好的怎么啊哈上就错了?
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