Write your own bubble sort function ( https://en.wikipedia.org/wiki/Bubble_sort) to sort all elements in x in ascending order.
You cannot cheat by using the function "sort.m".
If your solution even contains the word "sort", the assertion will fail!
This is an easy workaround you may want to also disallow.
First non-zero element in each column
Return unique values without sorting
Remove the two elements next to NaN value
select the primes of a vector
Count the numbers
Magnitude of a vector
Connect 4 (the boardgame)
How many complete pizzas
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