# Recursion Tree Method for Solving Recurrence Relations

## How can we use the recursion tree method to solve recurrence relations?

1. What is the formula for determining the height of the recursion tree? 2. How do we calculate the time complexity of a recurrence relation using the recursion tree method? 3. Can you provide an example of solving a recurrence relation using the recursion tree method?

## Explanation

The recursion tree method is a graphical representation that helps in understanding the recursive nature of a recurrence relation. By drawing a recursion tree, we can determine the height of the tree and calculate the time complexity of the relation.

When using the recursion tree method, we start by drawing a tree where each node represents a recursive call. The height of the tree can be calculated by analyzing the split of the problem size at each recursive call. Once we have determined the height of the tree, we can calculate the time complexity of the recurrence relation.

For example, let's consider the recurrence relation T(n) = T(n/4) + T(n/2) + n^2. By drawing the recursion tree for this relation and calculating the height of the tree, we can determine that the time complexity is O(n^2log(n)). This calculation involves analyzing the split of the problem size at each level of the recursion tree.

It is important to note that each recurrence relation may require a different approach to calculating the height of the tree and determining the time complexity. By practicing with various problems and understanding the concepts of recursion trees, you can improve your skills in solving recurrence relations efficiently.