I would be happy to help with your question! The reason why the compiler is having trouble deducing the types used by the map in your second example is that the order of the types in the map has changed from the first example. In the first example, the key type is a std::string and the value type is an int. However, in the second example, the key type is an int and the value type is a std::string. This difference in ordering is causing the compiler to have trouble determining the correct types to use in the function call.

To resolve this issue, you could explicitly specify the types when calling the function, like this:

int key2 = getkey<int, std::string>(map2, "apple");

By providing the template arguments explicitly, you are telling the compiler which types to use for the map's key and value types, and allowing it to successfully deduce the correct types for the function call.
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