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; }