如何从unordered_map中删除a向量元素

#include <iostream>
#include <unordered_map>
#include <vector>

int main() {
    std::unordered_map<int, std::string> myMap;
    myMap.insert({1, "apple"});
    myMap.insert({2, "banana"});
    myMap.insert({3, "orange"});
    myMap.insert({4, "grape"});

    std::vector<int> a = {2, 4};

    // 遍历unordered_map，找到包含a向量元素的键值对并删除
    for (auto it = myMap.begin(); it != myMap.end(); ) {
        if (std::find(a.begin(), a.end(), it->first) != a.end()) {
            it = myMap.erase(it);
        } else {
            ++it;
        }
    }

    // 输出删除后的unordered_map
    for (const auto& pair : myMap) {
        std::cout << pair.first << ": " << pair.second << std::endl;
    }

    return 0;
}