C++遍历map的key和value

可以使用迭代器来遍历map的key和value，示例代码如下：

#include <iostream>
#include <map>

int main()
{
    std::map<int, std::string> myMap = {{1, "one"}, {2, "two"}, {3, "three"}};

    // 遍历key
    std::cout << "Keys: ";
    for (auto const& pair : myMap)
    {
        std::cout << pair.first << " ";
    }
    std::cout << std::endl;

    // 遍历value
    std::cout << "Values: ";
    for (auto const& pair : myMap)
    {
        std::cout << pair.second << " ";
    }
    std::cout << std::endl;

    // 遍历key和value
    std::cout << "Keys and values: ";
    for (auto const& pair : myMap)
    {
        std::cout << "{" << pair.first << ", " << pair.second << "} ";
    }
    std::cout << std::endl;

    return 0;
}

输出结果为：

Keys: 1 2 3 
Values: one two three 
Keys and values: {1, one} {2, two} {3, three}