C++使用内部列表清除std::map

#include <iostream>
#include <map>

int main() {
    std::map<int, std::string> myMap;
    
    myMap[1] = "apple";
    myMap[2] = "banana";
    myMap[3] = "orange";
    myMap[4] = "grape";
    
    // 内部列表清除，删除键值小于等于2的元素
    for(auto it = myMap.begin(); it != myMap.end(); ) {
        if(it->first <= 2) {
            it = myMap.erase(it);
        } else {
            ++it;
        }
    }
    
    // 输出清除后的map
    for(const auto& kv : myMap) {
        std::cout << kv.first << ": " << kv.second << std::endl;
    }
    
    return 0;
}

3: orange
4: grape