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Decode Ways is a medium coding interview question covering dynamic programming, strings — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
A message is encoded where A=1, B=2, ..., Z=26. Count the number of ways to decode a digit string.
Example: "226" -> 3 (BZ, VF, BBF) Example: "06" -> 0 (invalid leading zero) Example: "11106" -> 2
A classic DP problem that appears at Google, Meta, and Anthropic coding interviews.
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A full interview loop is more than one round. These are the others, each with what is on the site for it.