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This problem was asked by Facebook.

Given the mapping a = 1, b = 2, ... z = 26, and an encoded message, count the number of ways it can be decoded.

For example, the message '111' would give 3, since it could be decoded as 'aaa', 'ka', and 'ak'.

You can assume that the messages are decodable. For example, '001' is not allowed.

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@Absinthe Since the main complexity issue here becomes space complexity im going to tackle this as a space optimized solution. Sould also be pretty close to ideal on time complexity if i do it right too.

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