[LintCode] Decode Ways 解码方法

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A message containing letters from A-Z is being encoded to numbers using the following mapping:

‘A‘ -> 1
‘B‘ -> 2
...
‘Z‘ -> 26
Given an encoded message containing digits, determine the total number of ways to decode it.

Example
Given encoded message 12, it could be decoded as AB (1 2) or L (12).
The number of ways decoding 12 is 2.

[LintCode] Decode Ways 解码方法

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原文地址：http://www.cnblogs.com/grandyang/p/5448531.html