W3School TIY Editor

#include <iostream> #include <map> using namespace std; int main() { map<string, int> people = { {"Bill", 19}, {"Steve", 32}, {"Elon", 26} }; // 通过键移除元素 people.erase("Bill"); // 这会抛出错误，因为 Bill 已不存在 cout << "Bill 的年龄是: " << people.at("Bill") << "\n"; return 0; }