How to resolve the algorithm Find the missing permutation step by step in the AutoHotkey programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Find the missing permutation step by step in the AutoHotkey programming language

Table of Contents

Problem Statement

Listed above are   all-but-one   of the permutations of the symbols   A,   B,   C,   and   D,   except   for one permutation that's   not   listed.

Find that missing permutation.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Find the missing permutation step by step in the AutoHotkey programming language

Source code in the autohotkey programming language

IncompleteList := "ABCD CABD ACDB DACB BCDA ACBD ADCB CDAB DABC BCAD CADB CDBA CBAD ABDC ADBC BDCA DCBA BACD BADC BDAC CBDA DBCA DCAB"

CompleteList := Perm( "ABCD" )
Missing := ""

Loop, Parse, CompleteList, `n, `r
  If !InStr( IncompleteList , A_LoopField )
    Missing .= "`n" A_LoopField

MsgBox Missing Permutation(s):%Missing%

;-------------------------------------------------

; Shortened version of [VxE]'s permutation function
; http://www.autohotkey.com/forum/post-322251.html#322251
Perm( s , dL="" , t="" , p="") {
   StringSplit, m, s, % d := SubStr(dL,1,1) , %t%
   IfEqual, m0, 1, return m1 d p
   Loop %m0%
   {
      r := m1
      Loop % m0-2
         x := A_Index + 1, r .= d m%x%
      L .= Perm(r, d, t, m%m0% d p)"`n" , mx := m1
      Loop % m0-1
         x := A_Index + 1, m%A_Index% := m%x%
      m%m0% := mx
   }
   return substr(L, 1, -1)
}


  

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