Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or Sj % Si = 0.
If there are multiple solutions, return any subset is fine.
Example 1:
nums: [1,2,3]
Result: [1,2] (of course, [1,3] will also be ok) Example 2:
nums: [1,2,4,8]
Result: [1,2,4,8]
- similar to 'longest increasing subsequence'
- if (a < b && b % a == 0) && (b < c && c % b == 0), then we have c % a == 0