Find shared objects across two log files

You are given two large log files representing activity on two different days. Each line of each log has three fields: - `timestamp`: a time value (you may treat it as an opaque string or integer) - `obj_id`: identifier of an object (string or integer) - `client_id`: identifier of a client (string or integer) The logs are not necessarily sorted by any field. Define an object as **interesting** if: 1. Its `obj_id` appears at least once in day 1's log **and** at least once in day 2's log; and 2. Across all of its appearances in both days combined, it is associated with at least **two distinct** `client_id` values. ### Tasks 1. Design and implement a function that, given file handles (or streaming iterators) for the two log files, returns the set of all such interesting `obj_id`s. 2. For your initial, straightforward in-memory solution (you may assume both logs fit in memory), state the time and space complexity in terms of the total number of log records. 3. Follow-up (memory constrained): Now assume the logs are very large and **cannot** both fit into memory at once. - You may still sequentially scan each file and you may perform external sorting. - Describe how you would modify your approach to work under this memory constraint. - Analyze the time and space complexity of this memory-efficient solution.