C++ error: Undefined symbols for architecture x86_64

Your compiler error is coming from the fact that your signature for the forward declaration of _num_steps does not match the signature of your definition of _num_steps. the type of steps_list does not match

Change your prototype line to:

void _num_steps(int amount, vector<int> possible_steps, vector<int> steps_list, vector<vector<int>> result);

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