1801A - The Very Beautiful Blanket - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
void solv2() {
	int n, m;
	cin >> n >> m;
	cout << n*m << endl;


	for (int i=0; i<n; ++i) {
		for (int j=0; j<m; ++j) {
			int k = i|(j<<20);
			cout << k << " " ;
		}
		cout << endl;
	}

	return;
}


int main() {
	int t; cin >> t;

	while (t--) solv2();
	return 0;
}