Clean Up Captions

Problem Overview

• For each pair of captions from for_you and following feeds, check if any common substring exists and return YES or NO.
• Input: two equal-length arrays of lowercase strings; Output: an array of YES/NO per index.
• Context: Clean up captions and optimize storage by detecting overlap across feeds and hashtags.
• Company: A TikTok interview question; this coding interview problem focuses on string overlap detection.