সি++

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
  };

  string result = user.at("নাম");

  cout << result;
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {};

  bool result = user.empty();

  cout << result;
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
  };

  user.insert({"শহর", "ঢাকা"});

  for (const auto& item : user) {
      cout << item.first << ": " << item.second << endl;
  }
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
  };

  user.erase("নাম");

  for (const auto& item : user) {
      cout << item.first << ": " << item.second << endl;
  }
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"}
  };

  map<string, string> info = {
      {"দেশ", "বাংলাদেশ"}
  };

  user.swap(info);

  for (const auto& item : user) {
      cout << item.first << ": " << item.second << endl;
  }
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
  };

  auto result = user.find("নাম");

  if (result != user.end()) {
      cout << result->second;
  }
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
  };

  bool result = user.contains("নাম");

  cout << result;
}

#include <iostream>
#include <map>
using namespace std;

int main() {
  map<string, string> user = {
      {"নাম", "মোঃ আরিফ"}
  };

  map<string, string> info = {
      {"দেশ", "বাংলাদেশ"}
  };

  user.merge(info);

  for (const auto& item : user) {
      cout << item.first << ": " << item.second << endl;
  }
}