如何实现两个std::map<unsigned，unsigned>的乘法合并？

#include <iostream>
#include <map>

std::map<unsigned, unsigned> multiplyMergeMaps(const std::map<unsigned, unsigned>& map1, const std::map<unsigned, unsigned>& map2) {
    std::map<unsigned, unsigned> result;

    for (const auto& pair1 : map1) {
        unsigned key = pair1.first;
        unsigned value1 = pair1.second;

        auto it = map2.find(key);
        if (it != map2.end()) {
            unsigned value2 = it->second;
            result[key] = value1 * value2;
        }
    }

    return result;
}

int main() {
    std::map<unsigned, unsigned> map1 = {{1, 2}, {2, 3}, {3, 4}};
    std::map<unsigned, unsigned> map2 = {{2, 5}, {3, 6}, {4, 7}};

    std::map<unsigned, unsigned> mergedMap = multiplyMergeMaps(map1, map2);

    for (const auto& pair : mergedMap) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}

2: 15
3: 24