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Given a list of product IDs (integers), return the IDs whose decimal representation contains any length‑3 substring of consecutive increasing digits (e.g., "123" or "456"). The core task is per-number digit/string scanning to detect a run of three digits where each next digit is one greater than the previous.
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Leetcode 3415. Find Products with Three Consecutive Digits
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Source snapshot: Nov 12, 2026
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