#include<iostream>
using std::cout; using std::cin; using std::endl;
#include<vector>
using std::vector;
 
long fn1(vector<long>& v, size_t indx){
  long result=0;
  long temp = v[indx];
  for (auto &e : v){           // Line 1
    e += temp;
    result += e;
  }
  return result;
 }
 
int main () {
  vector<vector<long>> v2d{ {0,1,2}, {3,4,5}, {6,7,8}, {9,10,11} };
  vector<long> v_result;
  long indx=0;
 
  cout << fn1(v2d[0], 1) << endl; // Line 2
 
  for (auto e : v2d[0])           // Line 3
    cout << e << " ";             // Line 4
  cout << endl;
 
  for (auto e : v2d)              // Line 5
    v_result.push_back( fn1(e,indx++) );
 
  cout << indx << endl;            // Line 6
  cout << v_result.size() << endl; // Line 7
  cout << v_result[1] << endl;     // Line 8      
}

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