如何获取std :: map的前n个元素

#include <iostream>
#include <map>
#include <vector>

int main() {
    // 创建一个std::map容器
    std::map<int, std::string> my_map = {
        {1, "One"},
        {2, "Two"},
        {3, "Three"},
        {4, "Four"},
        {5, "Five"},
    };

    // 获取前n个元素
    std::vector<std::pair<int, std::string>> my_vector(my_map.begin(), my_map.begin() + n);

    // 输出结果
    for (auto& pair : my_vector) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}

#include <iostream>
#include <map>
#include <vector>

int main() {
    // 创建一个std::map容器
    std::map<int, std::string> my_map = {
        {1, "One"},
        {2, "Two"},
        {3, "Three"},
        {4, "Four"},
        {5, "Five"},
    };

    // 获取前n个元素
    std::vector<std::pair<int, std::string>> my_vector;
    auto my_iterator = my_map.begin();
    std::advance(my_iterator, n);

    // 遍历结果
    for (auto& pair : my_vector) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}