W3School TIY Editor

#include <iostream>

#include <map>

using namespace std;

​

int main() {

  map<string, int> people = { {"Bill", 19}, {"Steve", 32}, {"Elon", 26} };

​

  // 尝试添加两个相同键的元素

  people.insert({"Jack", 23});

  people.insert({"Jack", 30});

  cout << "Jack 的年龄是: " << people.at("Jack") << "\n";

  return 0;

}