题解提交成功前
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违者必究
by ljc20020730 @ 2017-02-04 17:28:23
you are right
```cpp
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
cout<<n<<endl;
bool a[n];
memset(a,0,sizeof(a));
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
if(j!=i)
a[j]=!a[j];
cout<<a[j];
}
cout<<endl;
}
}
```
by 览遍千秋 @ 2017-05-29 13:08:23