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## 为什么会Runtime Error？

Posted by shuangkouchengzhi at 2014-04-29 16:41:56 on Problem 2386
```#include <iostream>
using namespace std;
void check(char**p,int,int);
int main()
{
int N,M;
cin>>M>>N;
char**p=new char*[N];
for (int i=0;i<N;i++) p[i]=new char[M];
for (int j=0;j<N+2;j++)
{
p[0][j]='.';
p[M+1][j]='.';
}
for (int i=1;i<M+1;i++)
{
p[i][0]='.';
p[i][N+1]='.';
}
for (int i=1;i<=M;i++)
for (int j=1;j<=N;j++)
cin>>p[i][j];
int counter=0;
for(int i=1;i<=M;i++)
for(int j=1;j<=N;j++)
if(p[i][j]=='W')
{
counter++;
p[i][j]=1;
check(p,i,j);
}
cout<<counter<<endl;
for (int i=0;i<N;i++) delete[] p[i];
delete[] p;
return 0;

}

void check(char**p,int hang,int lie)
{
bool flag=true;
while(flag)
{
flag=false;
if (p[hang-1][lie+1]=='W')
{
flag=true;
p[hang-1][lie+1]=1;
check(p,hang-1,lie+1);
}
for(int i=hang;i<=hang+1;i++)
for(int j=lie-1;j<=lie+1;j++)
{
if(p[i][j]=='W')
{
flag=true;
p[i][j]=1;
check(p,i,j);
}
}
}
if(flag==false) return;

}

```

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