Given a list of integers, we want to keep only the non-unique elements in this list. To do this, we need to remove all the unique elements (elements that appear only once). The resulting list, denoted by C, must not change the order of the original list. Complete the function dupe(L) which returns the new list C.
Example:
- If L=[1,2,3,1,3] then C=[1,3,1,3]
- If L=[1,2,3,4,5] then C=[]
- If L=[5,5,5] then C=[5,5,5]
- If L=[10,9,10,10,9,8] then C=[10,9,10,10,9]
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Could I persuade you to use isempty() when the correct result is empty, rather than comparing to [] (which is 0-by-0 and will not match a 1-by-0 array)?
😊 You've convinced me! I'll start using isempty() when the correct result is empty. Thanks for the tip!
Thank you!
This feels like quite a deceptive question. Looks easy but gets tricky to work it out for larger inputs.