wheel extraction

wheel.cpp

#include <tuple>
#include <list>
#include <string>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <thread>

#define ENTRY pair<string, unsigned int>
#define LABEL 0
#define WEIGHT 1

using namespace std;

int main(int argc, char const *argv[]) {
  list<ENTRY> l;

  int weight, max = 0;
  string label;

  srand(time(0));

  for (cin >> weight; weight > 0; cin >> weight) {
    max += weight;
    cin >> label;

    l.push_back(make_pair(label, weight));
  }

  int extract = rand() % max + 1;
  cout << extract << endl;
  list<ENTRY>::iterator it = l.begin();
  extract -= get<WEIGHT>(*it);

  while (extract > 0) {
    extract -= get<WEIGHT>(* ++it);
  }

  cout << get<LABEL>(*it) << endl;

  return 0;
}