如何通过数组初始化std :: map？

如何解决如何通过数组初始化std :: map？

我有一个任务，要用数组填充空白std::map<char,std::set<std::string>> myMap

const char* s[] = { "car","sun","surprise","asteriks","alpha","apple" };

并使用range based for和bindings打印。结果应该像S: sun,surprise

我已经用这种方式实现的最后一个（打印）

for (const auto& [k,v] : myMap)
{
    cout << "k = " << k << endl;
    std::set<std::string>::iterator it;
    for (it = v.begin(); it != v.end(); ++it)
    {
        cout << "var = " << *it << endl;
    }
}

但是我如何通过const char* s[]正确初始化此地图？

P.S。我知道，如何像std :: map std::set<std::string>> myMap = { {'a',{"abba","abart","audi"} } };一样初始化它，我读了StackOverflow上的this和this帖子，但我仍然不知道如何执行此操作通过这个数组。

解决方法

怎么样？

const char* s[] = { "car","sun","surprise","asteriks","alpha","apple" };
std::map<char,std::set<std::string>> myMap;

for (auto str : s)
    myMap[str[0]].insert(str);

// Result: {
//     'a' -> {"alpha","apple","asteriks"},//     'c' -> {"car"},//     's' -> {"sun","surprise"}
// }