摘要：
```cpp include include include using namespace std; const int dx[4]={0,1,0, 1}; const int dy[4]={1,0, 1,0};//四个方向 int x,y; int tot=1,sum[10001]={0},an 阅读全文
摘要：
```cpp include include include include using namespace std; const int maxx=1000001;// 最小生成树的这个东西一定不要开小了... int tot=1,x[maxx],y[maxx]; double ans=0;//注 阅读全文