you might want to specify in the problem that the sequence has to be made of N unique values
sorry, my mistake; it was unclear to me at first that the sequence had to contain a permutation of the values 1:N
Thank You. I have clarified that each value must be used.
oh man, this problem is brutal. i have a solution that can solve it for values of N between 33 and 39 inclusive in under a second, but as soon as I try 40 or 41, it runs forever (or at least past the end of my patience)
It seems there is a lot of variability depending on your particular search heuristics and the particular value of N. My solution performs in under 30 seconds for 19 out of the 20 cases 31
Hello Richard, Hello Alfonso, Hello @bmtran, Is it possible to solve this kind of problem without recursion ?
In general, sure, you can easily write these sort of heuristic-search algorithms without explicitly using recursion, or you could use non-search-based approaches, such as annealing, integer linear programming, etc. Now if you are asking whether exhaustive or other polynomial-time approaches are possible/practical for this problem I am not really sure about that. I believe this problem reduces to finding a full hamiltonian cycle over an N-node graph, so the only hope of bringing this out of the NP-hard umbrella would be exploiting some properties of these particular networks arising from the properties of perfect numbers, but so far I do not see any useful trick in this regard (so in short, perhaps it is possible but I do not know how; any thoughts?)
a bit faster (median t=0.56s for 31
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