関連ワード:  how to initialize a map in c++    how to initialize a map in c++ with 0    how to declare a map in c++    how to create a map in c++    how to initialize a unordered_map in c++    how to initialize a static map in c++    how to initialize a hash map in c++    how to initialize a map in cpp    how to declare and initialize a map in c++    how to initialize a map with values in c++