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简单递推

Posted by MadDoctor at 2012-02-01 22:55:28 on Problem 2033 and last updated at 2012-02-01 22:56:48 
初始条件dp[0] = 1, dp[1] = 1
然后每次dp[i]都跟dp[i - 1]和dp[i - 2] 有关系
当s[i]大于0时，dp[i] += dp[i - 1]
当s[i - 1]大于0 并且s[i - 1]和s[i]组成的两位数<=26时，dp[i] += dp[i - 2]
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