docker_space/frontier_cs_6/examples/gpt5_2.cpp

#include <bits/stdc++.h>
using namespace std;

vector<vector<int>> create_map(int N, int M, vector<int> A, vector<int> B) {
    int K = max(1, N);
    K = min(K, 240);
    vector<vector<int>> C(K, vector<int>(K, 1));
    for (int i = 0; i < min(K, N); ++i) {
        C[i][i] = i + 1;
    }
    return C;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int T;
    if (!(cin >> T)) return 0;
    while (T--) {
        int N, M;
        cin >> N >> M;
        vector<int> A(M), B(M);
        for (int i = 0; i < M; ++i) cin >> A[i] >> B[i];
        auto C = create_map(N, M, A, B);
        int P = (int)C.size();
        cout << P << "\n";
        for (int i = 0; i < P; ++i) {
            cout << (int)C[i].size() << (i + 1 == P ? '\n' : ' ');
        }
        cout << "\n";
        for (int i = 0; i < P; ++i) {
            for (int j = 0; j < (int)C[i].size(); ++j) {
                if (j) cout << ' ';
                cout << C[i][j];
            }
            cout << "\n";
        }
    }
    return 0;
}