How do I approach Coding & Algorithms interview questions?

Coding & Algorithms questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master coding & algorithms interviews.

What difficulty level is this interview question?

This is a medium difficulty Coding & Algorithms question, commonly asked during Onsite rounds at Amazon.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at Amazon during technical interviews.

Leaf Domain Cumulative Scores

Last updated: Jul 1, 2026

Quick Overview

This question evaluates a candidate's ability to model hierarchical string data and aggregate values along a tree structure, a common pattern in coding interviews involving tries and suffix-based hierarchies. It tests practical algorithm design skills such as identifying leaf nodes, propagating ancestor sums, and handling edge cases like single-label entries efficiently at scale.