My solution to problems 1, 2 and 3

[scay0x]

Some mentions for problem number 3:

• I resolved the problem in multiple ways, because I was not sure about each proposed solution.
• However I still proposed a solution with nested fors, although the problem requirement clearly specified to not.

[alexandru-calinoiu]

Took a look at the problems, apprecite the fact that you've done them in kotlin, made a couple of commets take a look.

The main problem is that you did not do any unit tests to prove the functionality of any of the solutions.

[alexandru-calinoiu]

The implementation is straight forward

The idea was that you get an array of n elements as an input, you don't have to generate the input.

[alexandru-calinoiu]

There a couple of usefull functions for arrays in kotlin scout the docs maybe you can find a way to make this more idiomatic.

[alexandru-calinoiu]

Can you think of a way to do this in one loop?

Also what about some edge cases? empty array, one item array ....

[alexandru-calinoiu]

contains most likely uses a loop in it's implementation, so you are still using a loop inside a loop, there is a clear way to solve this problem.

[deniscoman]

Beside what @alexandru-calinoiu said, you have some naming issues that makes your code harder to read.

1. It's better to write all your code in English so anyone can understand what are you trying to do.
2. Here you can find some naming conventions that will help you, and anyone else who read your code, to understand what your code does. This will be helpful in the feature no matter what programming language you will use.