Talk:Rare numbers: Difference between revisions
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→Tweaks, C++: response to Nigel Galloway
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--[[User:Nigel Galloway|Nigel Galloway]] ([[User talk:Nigel Galloway|talk]]) 14:09, 4 January 2021 (UTC)
* Do 2 through 11 digits by only looking at "middles" (no "outers") - accomplished by adding an additional definition for nLH() that takes only the function of optional long when doing less that 12 digits, limit diffs to be above zero, and sums to be above a limit at which smaller squares produced are less than the forward number itself (pow10[n-1] * 4) makeL(), makeH() return nLH() now, instead of nLH() components: Okay but no need for an extra global variable. It is really a parameter to nLH's constructor (single) as now only one constructor is required.--[[User:Nigel Galloway|Nigel Galloway]] ([[User talk:Nigel Galloway|talk]]) 14:09, 4 January 2021 (UTC)
* The pair "construction" shouldn't incur an
:::Thank you for the code review and adopting some of the tweaks I presented. Good fix for my awkward handling of digits 2-11. I agree about the pair construction, I only removed it to speed up my C# translation, which was slightly impacting performance (perhaps due to an awkward translation on my part.)<br><br>
:::I agree that digit '5' ought to be considered in the "diff" side. Even though it doesn't contribute to any solution in the ''Int64'' range, if ''Int128'' ever becomes part of C++, your program should be easily extended to the point where checking "diff 5" will contribute a solution. My decision to omit checking '5' was for performance reasons since we are constricted to ''Int64''.--[[User:Enter your username|Enter your username]] ([[User talk:Enter your username|talk]]) 00:01, 25 January 2021 (UTC)
== 21+ digit rare numbers ==
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