2148f.cpp

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

#define all(x) begin(x), end(x)
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<bool> vb;
typedef vector<vb> vvb;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int t;
    cin >> t;
    while (t--) {
        int n;
        cin >> n;

        vvi rows(n);
        for (int i = 0; i < n; i++) {
            int k;
            cin >> k;
            vi nums;
            for (int j = 0; j < n; j++) {
                int x;
                cin >> x;
                nums.push_back(x);
            }
            rows[i] = nums;
        }
    }
}