variable-sized-arrays.cpp

// Variable Sized Arrays
// Find the element described in the query for integer sequences.
// 
// https://www.hackerrank.com/challenges/variable-sized-arrays/problem
// 

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


int main() {
 /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
 vector<vector<int>> w;
 int n, q;
 
 cin >> n >> q;
 while (n-- != 0)
 {
 size_t k; 
 int x;
 vector<int> v;
 
 cin >> k;
 while (k-- != 0) { cin >> x; v.push_back(x); }
 
 w.push_back(v);
 }
 while (q-- != 0)
 {
 size_t i, j;
 cin >> i >> j; 
 cout << w[i][j] << endl;
 }
 return 0;
}