Solve sliding-window, flattening, decode, and O(1) random set

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Question

Solve sliding-window, flattening, decode, and O(1) random set

PracHub · Accepted Answer

This multi-part question evaluates competence in string processing and nested parsing, linked-list flattening and recursion depth management, dynamic set design for O(1) operations, and algorithmic complexity analysis with attention to edge-case handling.

Quick Overview

Solve sliding-window, flattening, decode, and O(1) random set