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2\$\begingroup\$ I assume it's intended that when you select all, copy, then paste, the paste doesn't overwrite the selection but appends to it? \$\endgroup\$– xnorCommented Jul 4 at 20:23
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5\$\begingroup\$ Does "containing n copies of the original string" mean at least n, or exactly n? \$\endgroup\$– xnorCommented Jul 4 at 20:24
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2\$\begingroup\$ I don't understand why \$f(4)=6\$. Can't you quadruple in just 5 operations by doing select-all, copy, paste, paste, paste? Since the pastes append as you say, only 3 are needed here. \$\endgroup\$– xnorCommented Jul 4 at 22:36
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5\$\begingroup\$ I went through the math.se post and I think there is a typo in the formula: (1,1) should be (0,1). This change affects all test inputs which are in the form of 4^k. Added a comment about this on the math.se post too. \$\endgroup\$– BubblerCommented Jul 4 at 23:49
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4\$\begingroup\$ The fixed formula agrees with an algorithmic solution for up to 1e6. \$\endgroup\$– BubblerCommented Jul 5 at 0:52
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