W3School TIY Editor

#include <iostream> #include <map> using namespace std; int main() { map<string, int> people = { {"Bill", 19}, {"Steve", 32}, {"Elon", 26} }; // 将 Bill 的值从 19 改为 50 people.at("Bill") = 50; cout << "Bill 的年龄是: " << people.at("Bill"); return 0; }