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    $\begingroup$ Please take some time to improve your post. Your sentences are missing words, you talk about four columns and then list only three, and it is unclear how your notion of "best" is non-binary. Furthermore, how are "speed" and "runtime" different? Which cost measures are the most important to you? $\endgroup$ Commented Oct 17, 2016 at 23:35
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    $\begingroup$ What have you tried? Where did you get stuck? We do not want to just hand you the solution; we want you to gain understanding. However, as it is we do not know what your underlying problem is, so we can not begin to help. See here for tips on asking questions about exercise problems. If you are uncertain how to improve your question, why not ask around in Computer Science Chat? $\endgroup$ Commented Oct 17, 2016 at 23:35