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.
Swap the input arguments
Make one big string out of two smaller strings
Is this matrix orthogonal?
Calculate the Hamming distance between two strings
Find the nearest integer
Exponents in Factorials
There are 10 types of people in the world
Miles to go before I sleep
Three...is a magic number.
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