The first test case is wrong 0 and 21 are triangular numbers too (https://oeis.org/A000217), therefore:
[ 0, 6;
PS: And 0 does not make a pair with every number in this case.
What's wrong with the case x=20 in test suite? Why is y_correct=[ 10 10] ? I cannot pass it.
I don't know why your cheat isn't working, but look closely at what numbers your "for n=1:N" loop generates for that case.
Who Has the Most Change?
It dseon't mettar waht oedrr the lrettes in a wrod are.
Change the sign of even index entries of the reversed vector
Recaman Sequence - II
Go to the head of the class!
Converting numbers back from extended form
Numbers in extended form
Must be in the front row...
Miles to go before I sleep
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