FACEBOOK CODING INTERVIEW QUESTION - DECODE WAYS (LeetCode)

This is one of Facebook's favorite interview questions to ask! Decode Ways LeetCode coding solution. Coding Interviews Decode Ways (LeetCode) question and explanation.

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This question is a commonly asked by the following companies: Facebook, Google, Microsoft, Uber, Twitter, Bloomberg, and Yahoo.

Link to problem: https://leetcode.com/problems/decode-ways/

Intuition behind solution: Use bottom-up processing to arrive at the solution. In bottom-up processing we memoize (or remember) the answers to subproblems to answer the current problem. We initialize our base cases to 1 i.e. the number of ways to decode a string of length 0 and 1 or 0 for a string of length 1. We then iterate up to the length of s, calculating the potential number of decodings using the subproblems we have already solved. Once our loop terminates we return dp[s.length()] as that index stores the number of decoding for a string of length s (dp[index] stores the number of ways to decode a string of length "index").
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