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

void add_entry(std::vector<std::vector<std::string>>& database, std::string key, std::string value) {
  database.push_back({key, value});
}

void remove_entry(std::vector<std::vector<std::string>>& database, std::string key) {
  int index = 0;
  for (std::vector<std::string>& entry : database) {
    index++;
    if (entry[0] == key) {
      database.erase(database.begin() + index);
    }
  }
}

void prompt_user(std::vector<std::vector<std::string>>& database) {
  std::string mode;
  std::cin >> mode;
  if (mode == "add") {
    std::string key;
    std::string value;
    std::cin >> key;
    std::cin >> value;
    add_entry(database, key, value);
  } else if (mode == "rem") {
    std::string key;
    std::cin >> key;
    remove_entry(database, key);
  } else {
    prompt_user(database);
  }
}

int main() {
  std::vector<std::vector<std::string>> database;

  database = {
    { "name", "username" },
    { "john", "unwanted_guest"},
    { "laith", "ducc" }
  };
  
  while (true) {
    for (std::vector entry: database) {
      std::cout << entry[0] << " | " << entry[1] << std::endl;
    }
    prompt_user(database);
  }
}