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--- markow:non-unique_elements [2019/08/25 23:03] – Externe Bearbeitung 127.0.0.1
+++ markow:non-unique_elements [2024/03/03 22:36] (aktuell) – Tscherter Vincent
@@ Zeile 1: / Zeile 1: @@
+====== Non-unique Elements ======
+{{ :markow:pasted:20170905-223117.png?300}}
+You are given a non-empty list of integers (X). For this task, you should return a list consisting of only the non-unique elements in this list. To do so you will need to remove all unique elements (elements which are contained in a given list only once). When solving this task, do not change the order of the list. Example: ''[1, 2, 3, 1, 3]'' ''1'' and ''3'' non-unique elements and result will be ''[1, 3, 1, 3]''.
+== Examples ==
+^ Input ^ Output |
+| ''[1, 2, 3, 1, 3]'' | ''[1, 3, 1, 3]'' |
+| ''[1, 2, 3, 4, 5]'' | ''[]'' |
+| ''[5, 5, 5, 5, 5]'' | ''[5, 5, 5, 5, 5]'' |
+| ''[10, 9, 10, 10, 9, 8]'' | ''[10, 9, 10, 10, 9]'' |
+== Solution ==
+<code text>
+/ζ(\d+)(.*)ζ\1/ζ$1$2λ$1/
+/ζ(\d+)(.*)λ\1/λ$1$2λ$1/
+/ζ(\d+)(, )?//
+/, ]/]/
+/[ζλ]//g !
+/(\d+)/ζ$1/g
+</code>
+== Reference ==
+  * https://js.checkio.org/mission/non-unique-elements/

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