How do you approach a recursion question?

6 Answers

1. Write a prototype for the recursive function.
2. Write a comment that describes what the function does.
3. Determine the base case (there may be more than one), and its solution(s).
4. Determine what smaller problem (or problems) to solve.
5. Use the solutions of the smaller problem to solve the larger problem. (

Does every recursive function have a return value?

All functions – recursive or not – have one or more return . The return may or may not include a value. It is for you to decide when you write the function. All explicit written return statements must return the correct type.

Can every problem be solved with recursion?

1 Answer. So no, every problem that can be solved iterative can be solved with recursion and vice-versa. It can, however, still be better to use an iterative algorithm over a recursive because you can do different things.

Which of the following problems can be solved using recursion?

Problems like finding Factorial of a number, Nth Fibonacci number and Length of a string can be solved using recursion.

How do you solve recurrence complexity?

How to solve time complexity Recurrence Relations using Recursion Tree method?

1. Draw a recursive tree for given recurrence relation.
2. Calculate the cost at each level and count the total no of levels in the recursion tree.
3. Count the total number of nodes in the last level and calculate the cost of the last level.

Does recursion need a return?

It doesn’t have a return statement. The only requirement for a function to be recursive is that it should call itself.

Does recursion need a return statement?

You don’t need to understand anything special about recursive functions. return makes the expression that called this particular invocation of the function become the value that was given to return .