leetcode Decode Ways
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代码
class Solution {public: int numDecodings(string s) { int len = s.length(); if(len==0) return 0; int dp[len+1]; dp[0] = 1; dp[1] = s[0]=='0'? 0:1; for(int i = 2; i <= len; ++i) { if(s[i-1]!='0') dp[i] = dp[i-1]; else dp[i] = 0; if(s[i-2]=='1'||(s[i-2]=='2'&&s[i-1]<='6')) dp[i] += dp[i-2]; } return dp[len]; }};参考自 http://www.cnblogs.com/TenosDoIt/p/3451920.html
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