Sum HDU4704

Description Sample Input 2 Sample Output 2 Hint 1. For N = 2, S(1) = S(2) = 1. 2. The input file consists of multiple test cases. 將N拆分成1-n個數，問有多少種組成方法。比如Sn=s1+s2+s3+..sn,S(n+1)=s1+s2+s3+...sn+s(n+1);

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