Hello everybody.I'm looking at this problem and I've no idea how to solve it. It's about that,with minimum number of 1's and operations of addition, multiplication and parenthesis you must obtain positive number n.
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I think it can help you
So, suppose we know this minimum for all
1 <= i < n. (Ifn == 1, answer is1). How can we getn? Only by addition or multiplication. So,answer[n] = minimum(answer[a] + answer[b] | a + b == n or a * b == n, a < n, b < n)