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f[i][j] = f[i][j - 1] + f[i - j][j] ;

Posted by 117474335 at 2010-10-15 13:57:13 on Problem 3181
解释:
f[i][j] 表示 数i 用 1 到 j 拼 , 共有多少种情况;
可分为两种情况:
1、最大数小于j, 则为用1到就j - 1拼i;
2、最大数等于j, 则为用1到j拼 减去一个 最大数j的 i - j ;
简单递推即可 ;

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