Order by pair comparisons: Difference between revisions
→{{header|F_Sharp|F#}}
Line 306:
=={{header|F_Sharp|F#}}==
This task uses [https://rosettacode.org/wiki/Factorial_base_numbers_indexing_permutations_of_a_collection#F.23 Factorial base numbers indexing permutations of a collection (F#)]
<lang fsharp>
// Order by pair comparisons. Nigel Galloway: April 23rd., 2021
let clrs=let n=System.Random() in lN2p [|for g in 7..-1..2->n.Next(g)|] [|"Red";"Orange";"Yellow";"Green";"Blue";"Indigo";"Violet"|]
let
let mutable z=0 in printfn "%
▲let mutable z=0 in printfn "%s sorted to %A using %d comparisons" clrs (clrs.Split ' '|>Array.choose fN|>Array.sortWith(fun n g->z<-z+1; compare n g)) z
</lang>
{{out}}
Possible interaction:
<pre>
Is Indigo less than Orange
Yes
Blue Red Yellow▼
Is Blue less than Orange
Yes
Is Blue less than Indigo
No
Is Yellow less than Orange
Red Orange Yellow Green Blue Indigo Violet sorted to [|Violet; Red; Green; Indigo; Blue; Yellow; Orange|] using 19 comparisons▼
Yes
Is Yellow less than Blue
No
Is Red less than Orange
Yes
Yes
Is Red less than Blue
Yes
Is Red less than Indigo
Yes
Is Green less than Orange
Yes
Is Green less than Yellow
Yes
Is Green less than Blue
Yes
Is Green less than Indigo
Yes
Is Green less than Red
No
Is Violet less than Orange
Yes
Is Violet less than Yellow
Yes
Is Violet less than Blue
Yes
Is Violet less than Indigo
Yes
Is Violet less than Green
Yes
Is Violet less than Red
Yes
▲
</pre>
| |||