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An interesting problem I've run to recently is the following (I tried to express it using Jon Bentley's convention): Input: Two sorted integer arrays A and B in increasing order and of different sizes N and M, respectively. Output: A sorted integer array C in increasing order that contains elements that appear in both A and B Contraints: No duplicates are allowed in C Example: For input A = {3,6,8
Intersection of sorted lists is a cornerstone operation in many applications including search engines and databases because indexes are often implemented using different types of sorted structures. At GridDynamics, we recently worked on a custom database for realtime web analytics where fast intersection of very large lists of IDs was a must for good performance. From a functional point of view, w
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