This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
int main()
{
int n,m;
cin>>n>>m;
int a,b;
for(int i =0;i<m;i++)
{
cin>>a>>b;
}
cout<<n<<"\n";
for(int i = 1;i<n;i++)
{
for(int j = 0;j<n;j++)
{
if(j == i)
{
cout<<0<<" ";
}
else
{
cout<<j<<" ";
}
}
cout<<"\n";
}
for(int i = 0;i<n;i++)
{
cout<<0<<" ";
}
}
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