😎 Challenge: Find The Chosen One! 😎

Question

We have an array (or list) with at least 3 elements in it. All elements are equal, except for one.

Use whatever language you want to find that unique element!

Some example arrays/lists (you can make your own, and as many as you want) and their respective results:

[1, 1, 1, 2, 1, 1] -> 2
[2, 2, 5, 2, 2, 2, 2, 2, 2] -> 5
[0, 0, 0.55, 0, 0] -> 0.55
["hello", "hello", "hello", "hello", "world", "hello"] -> "world"
["sololearn", 4, 4, 4, 4] -> "sololearn"

Happy coding!

Answer 1

Sorry for being late to the party! Here's my C# implementation ✌

LINQ One-Liner〰
arr.GroupBy(o => o.ToString())
.Single(g => g.Count() == 1)
.Single()

I devoted myself to use LINQ to my fullest extent. ❤ Enjoy!

https://code.sololearn.com/cH3Zf78C9mJc/?ref=app

Answer 2

https://code.sololearn.com/cNipRkRqHaPE/#java

My implementation in Java!

Answer 3

My try in Python, and my first challenge in SL! 🤗
https://code.sololearn.com/cL6J0YqYq3wH/?ref=app

Answer 4

🙍
https://code.sololearn.com/c4J9bCCua6hX/?ref=app

Answer 5

https://code.sololearn.com/WFCs96q31mFU/#js

Answer 6

well, here mine, practicing on python, three-line style :)
https://code.sololearn.com/cu9i6Fo8UbXL/?ref=app

Answer 7

https://code.sololearn.com/cUnHFGzBqJvC/?ref=app
My lazy one :P

Answer 8

@$Vengat
lol

Answer 9

updated.
this is a real try.
https://code.sololearn.com/cb2BqD8Rzgnu/?ref=app

Answer 10

nice challenge, I will do it later...

Answer 11

https://code.sololearn.com/cEB15YY802bo/#py

Answer 12

That's damn hardcoded

Answer 13

You can make it a one-liner too

Answer 14

Will do

Answer 15

One line...Can also find element present p times
https://code.sololearn.com/c9Yb1Otvo5GW/?ref=app

Answer 16

implementation in c++ (working except for lists/vecs with different element types... not handy in c++ keywords boost any etc...)
https://code.sololearn.com/cL1b4YaSfuU5/?ref=app

Answer 17

will find it