Write a recursive function called complement

Question

Problem:

Question 1: Use python Write a recursive function called complement(n) that returns the complement of a string of binary digits. That is, the "flipped" representation of the input string n.

Question 2: Generics key value pair

1. Declare a generic class called KeyValuePair
2. It has two type parameters, K and V
3. Declare two fields: key of type K and value of type V
4. Create a parameterized constructor to initialize the fields

Please Explain don't just write the answer.