all tasks

Task/Sorting-algorithms-Permutation-sort/AutoHotkey/sorting-algorithms-permutation-sort.ahk

@@ -0,0 +1,43 @@
+MsgBox % PermSort("")
+MsgBox % PermSort("xxx")
+MsgBox % PermSort("3,2,1")
+MsgBox % PermSort("dog,000000,xx,cat,pile,abcde,1,cat")
+
+PermSort(var) {                          ; SORT COMMA SEPARATED LIST
+   Local i, sorted
+   StringSplit a, var, `,                ; make array, size = a0
+
+   v0 := a0                              ; auxiliary array for permutations
+   Loop %v0%
+      v%A_Index% := A_Index
+
+   While unSorted("a","v")               ; until sorted
+      NextPerm("v")                      ; try new permutations
+
+   Loop % a0                             ; construct string from sorted array
+      i := v%A_Index%, sorted .= "," . a%i%
+   Return SubStr(sorted,2)               ; drop leading comma
+}
+
+unSorted(a,v) {
+   Loop % %a%0-1 {
+      i := %v%%A_Index%, j := A_Index+1, j := %v%%j%
+      If (%a%%i% > %a%%j%)
+         Return 1
+   }
+}
+
+NextPerm(v) { ; the lexicographically next LARGER permutation of v1..v%v0%
+   Local i, i1, j, t
+   i := %v%0, i1 := i-1
+   While %v%%i1% >= %v%%i% {
+      --i, --i1
+      IfLess i1,1, Return 1 ; Signal the end
+   }
+   j := %v%0
+   While %v%%j% <= %v%%i1%
+      --j
+   t := %v%%i1%, %v%%i1% := %v%%j%, %v%%j% := t,  j := %v%0
+   While i < j
+      t := %v%%i%, %v%%i% := %v%%j%, %v%%j% := t, ++i, --j
+}