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 <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
int n, m; cin >> n >> m;
for (int i = 0; i < m; i++){
int a, b; cin >> a >> b;
}
cout << n << endl;
for (int i = 0; i < n; i++){
if (i % 2){
for (int j = 1; j <= n; j++){
cout << j / 2 << ' ';
}
}else{
for (int j = 0; j < n; j++){
cout << j / 2 << ' ';
}
}
cout << endl;
}
}
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