Which data type should i use to create a map or dictionary in c++?

Question

I have a problem in which i have to make contact list by using map or dictionary.

Answer 1

For example you will approach a two-dimensional array.
You can use separate file (e.g. *.ini) to keep it.

Answer 2

to create map or dictionary. You don't need data type. You need data structure, That is tree. Trie used for creating dictionary. And a perfect hash table will be the best.

Answer 3

to keep what??

Answer 4

are you asking me