How do you calculate total time from a Recursion Tree?
You sum up the amount of non-recursive work done across all nodes at every level of the tree.
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More FAQs in Understanding the Recursion Tree Method
A Recursion Tree is a visual diagram where each node represents a function call, and the branches represent the subsequent recursive calls made from that function.
Because every function call spawns exactly two more function calls, causing the total number of operations to double at every level of depth.
You use Dynamic Programming (Memoization). By caching the result of a node, you prevent the tree from recalculating overlapping branches, collapsing O(2^N) into O(N).
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