如何在c++中获取键值

#include <iostream>
#include <map>

int main() {
    std::map<int, std::string> myMap;
    myMap[1] = "Value1";
    myMap[2] = "Value2";
    myMap[3] = "Value3";

    // 获取键值
    std::map<int, std::string>::iterator it = myMap.find(2);
    if (it != myMap.end()) {
        std::cout << "键值为2的值为：" << it->second << std::endl;
    } else {
        std::cout << "未找到键值为2的元素" << std::endl;
    }

    return 0;
}

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<int, std::string> myMap;
    myMap[1] = "Value1";
    myMap[2] = "Value2";
    myMap[3] = "Value3";

    // 获取键值
    std::unordered_map<int, std::string>::iterator it = myMap.find(2);
    if (it != myMap.end()) {
        std::cout << "键值为2的值为：" << it->second << std::endl;
    } else {
        std::cout << "未找到键值为2的元素" << std::endl;
    }

    return 0;
}