Web Reference: Jul 11, 2025 · Checking if two lists share any common elements is a frequent requirement in Python. It can be efficiently handled using different methods depending on the use case. In this article, we explore some simple and effective ways to perform this check. This solution efficiently finds common reachable nodes using DFS on a reversed graph. The key insight is reversing edges to find all nodes that can reach specific targets, then checking for intersections. The problem is that as soon as you find the first common element in the two lists, you return that single element only. Your solution could be fixed by creating a result list and collecting the common elements in that list:
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