07. Miners

#include <iostream>
#include <unordered_map>
#include <string>
#include <vector>
using namespace std;

int main()
{
  vector<string> resources;
  unordered_map<string, int> Quantity;

  string resource;
  while (cin >> resource && resource != "stop")
  {
    if (Quantity.find(resource) == Quantity.end())
    {
      resources.emplace_back(resource);
      Quantity.emplace(resource, 0);
    }

    int quantity;
    cin >> quantity;
    Quantity[resource] += quantity;
  }

  for (const auto &item : resources)
  {
    const auto& it = Quantity.find(item);
    cout << it->first << " -> " << it->second << endl;
  }

  return 0;
}