@[WCX12312](/user/1253413) `a[x-2][y]=a[x-1][y]=a[x+1][y]=a[x+2][y]=1;`可能会出现负数的情况
by __zaa__ @ 2024-04-07 17:15:32
万一你的x小于2，那数组就成负数了
by RockyChen @ 2024-04-07 17:16:30
```cpp
#include <bits/stdc++.h>
using namespace std;
int n,m,k,a,b,ans;
int s[5005][5005];
bool pd(int x,int y)
{
if(x<1||y<1||x>n||y>n)
return 0;
return 1;
}
int main()
{
cin>>n>>m>>k;
for(int i=1;i<=m+k;i++)
{
cin>>a>>b;
for(int x=-2;x<=2;x++)
for(int y=-2;y<=2;y++)
if((i>m||abs(x)+abs(y)<=2)&&pd(x+a,b+y))
s[x+a][b+y]++;
}
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
ans+=s[i][j]==0;
cout<<ans<<endl;
return 0;
}
```
给个关注吧，能不能加一下www.luogu.com.cn/team/60983
by cdxxmashaoyang @ 2024-04-07 17:19:56
@[cdxxmashaoyang](/user/997809)
```cpp
if((i>m||abs(x)+abs(y)<=2)&&pd(x+a,b+y))
```
这句是啥意思
by WCX12312 @ 2024-04-07 17:38:12
这个就是防止出现负数
by cdxxmashaoyang @ 2024-04-07 19:14:24