int ans=0
by o_QAQ_o @ 2019-04-06 12:56:10
全局变量默认为0
by wxy_god @ 2019-04-06 12:56:43
对啊
by chzhc @ 2019-04-06 13:01:44
if(a<0||a>n||b>m) return;
判越界还要多一个条件吧
by Earth执剑人罗辑 @ 2019-04-06 13:12:42
>x[4]={2,1,-1,-2},y[4]={1,2,-2,-1};
这错了
by VTloBong @ 2019-07-29 16:17:17
~~对着题解打的？（察觉~~
by Crazyyx @ 2019-12-15 21:59:54
@[Crazy丶影兮](/user/183476) 这叫借鉴+学习
by xhQYm @ 2019-12-25 18:32:56
x[4]={2,1,-1,-2},y[4]={1,2,-2,-1};
这错了.正确的应该这么写：
```cpp
y[4]={1,2,2,1};
by ewenakioi @ 2020-01-12 16:23:23