如何从最高值的unordered_map中获取密钥？

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<std::string, int> myMap = {
        {"key1", 10},
        {"key2", 20},
        {"key3", 30},
        {"key4", 20},
        {"key5", 40}
    };

    int max_value = INT_MIN;
    std::string max_key;

    for (const auto& pair : myMap) {
        if (pair.second > max_value) {
            max_value = pair.second;
            max_key = pair.first;
        } else if (pair.second == max_value && pair.first > max_key) {
            max_key = pair.first;
        }
    }

    std::cout << "最高值对应的密钥是：" << max_key << std::endl;

    return 0;
}