_fur | C++ Koko Sip

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n, t;
    int temp, temp2;
    cin >> n >> t;
    vector<vector<int> > mat(n);

    for (int i = 0; i < n; i++) {
        cin >> temp;
        mat.push_back(vector<int>(temp));
        for (int j = 0; j < temp; j++) {
            cin >> temp2;
            mat[i].push_back(temp2);
        }
    }

    for (int i = 0; i < t; i++) {
        cin >> temp >> temp2;
        cout << mat[temp][temp2] << endl;
    }

    return 0;
}