#include <string>
#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

int main()
{ ifstream fin;
  fin.open("/home/www/dics/web2.txt");
  if (fin.fail())
  { cerr << "could not open dictionary file\n";
    exit(1); }
  vector <int> positions;
  int pos = 0;
  while (true)
  { string line;
    getline(fin, line);
    if (fin.fail()) break;
    positions.push_back(pos);
    cout << "pushing " << pos << "\n";
    pos += line.length() + 1; }
  fin.clear();
  while (true)
  { cout << "line number: ";
    int n;
    cin >> n;
    cout << "positions[ " << n << "] = " << positions[n] << "\n";
    fin.seekg(positions[n]);
    string line;
    getline(fin, line);
    cout << line << "\n"; }
  fin.close(); }