b=x2;
z=y2;
end
end
[x3,y3]=you(a);
if y3<z
if panduan(x3)
b=x3;
z=y3;
end
end
a1=b;
end
if y==2
[x1,y1]=shang(a);
if y1<z
if panduan(x1);
b=x1;
z=y1;
end
end
[x2,y2]=xia(a);
if y2<z
if panduan(x2);
b=x2;
z=y2;
end
end
[x3,y3]=zuo(a);
if y3<z
if panduan(x3);
b=x3;
z=y3;
end
end
[x4,y4]=you(a);
if y4<z;
if panduan(x4)
b=x4;
z=y4;
end
end
a1=b;
end