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Code Golf

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  • \$\begingroup\$ Could you show an explicit example of the input your code accepts? Say for a 2 by 2 matrix. Also, you seem to have golfed your code! (This is a fastest-code challenge, not a golf challenge.) \$\endgroup\$ Commented Mar 3, 2018 at 13:48
  • \$\begingroup\$ @Lembik For the record, as I said in chat, the input is in the same format as the examples - json (actually, it only reads the numbers and uses n=sqrt(len(input))/2). I usually write short code, even when golfing is not a requirement. \$\endgroup\$ Commented Mar 3, 2018 at 14:46
  • \$\begingroup\$ What's the largest size matrix this new code should support? \$\endgroup\$ Commented Mar 5, 2018 at 10:00
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    \$\begingroup\$ -march=native will make a big difference here. At least on TIO, it nearly cuts the wall time in half. \$\endgroup\$ Commented Mar 5, 2018 at 14:40
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    \$\begingroup\$ Also, at least on TIO, the executable produced by gcc will be even faster. \$\endgroup\$ Commented Mar 5, 2018 at 14:52