Common sorted list

Common sorted list is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Given an integer array nums, the goal is create common sorted list with unique elements.

Example

nums = [5,1,3,8,9,4,8,7], [3,5,9,8,4], [1,3,7,9]

output = [1,3,4,5,7,8,9]

REXX

<lang rexx>/*REXX pgm creates and displays a common sorted list of a specified collection of sets*/ parse arg a /*obtain optional arguments from the CL*/ if a= | a="," then a= '[5,1,3,8,9,4,8,7] [3,5,9,8,4] [1,3,7,9]' /*default sets.*/ x= translate(a, ,'],[') /*extract elements from collection sets*/ se= words(x)

1. = 0; $= /*#: number of unique elements; $: list*/

$= /*the list of common elements (so far).*/

   do j=1  for se;  _= word(x, j)               /*traipse through all elements in sets.*/
   if wordpos(_, $)>0  then iterate             /*Is element in the new list? Yes, skip*/
   $= $ _;   #= # + 1;    @.#= _                /*add to list; bump counter; assign──►@*/
   end   /*j*/

$= call eSort # /*use any short (small) exchange sort.*/

                do k=1  for #;   $= $  @.k      /*rebuild the $ list, it's been sorted.*/
                end   /*k*/

say 'the list of sorted common elements in all sets: ' "["translate(space($), ',', " ")']' exit 0 /*stick a fork in it, we're all done. */ /*──────────────────────────────────────────────────────────────────────────────────────*/ eSort: procedure expose @.; arg h 1 z; do while h>1; h= h%2; do i=1 for z-h; j= i; k= h+i

       do while @.k<@.j; t=@.j; @.j=@.k; @.k=t; if h>=j then leave; j=j-h; k=k-h; end;end
       end;     return                          /*this sort was used 'cause of brevity.*/</lang>

output   when using the default inputs:

the list of sorted common elements in all sets:  [1,3,4,5,7,8,9]

Ring

<lang ring> nums = [[5,1,3,8,9,4,8,7],[3,5,9,8,4],[1,3,7,9]] sumNums = []

for n = 1 to len(nums)

   for m = 1 to len(nums[n])
       add(sumNums,nums[n][m])
   next

next

sumNums = sort(sumNums) for n = len(sumNums) to 2 step -1

   if sumNums[n] = sumNums[n-1]
      del(sumNums,n)
   ok

next

sumNums = sort(sumNums)

see "common sorted list elements are: " showArray(sumNums)

func showArray(array)

    txt = ""
    see "["
    for n = 1 to len(array)
        txt = txt + array[n] + ","
    next
    txt = left(txt,len(txt)-1)
    txt = txt + "]"
    see txt

</lang>

Output:

common sorted list elements are: [1,3,4,5,7,8,9]