Interesting problem but tests are too tricky.
I am not sure that a list of equal numbers qualifies as a series. Would it be a geometric or an arithmetic series?
'Randperm' is making this question a whole lot harder...
How long is the longest prime diagonal?
Is the input divisible by 3?
Find nth maximum
Generate Square Wave
self description 2.0
Graph Algorithms - 2 : Chromatic Number
longest common substring : Skipped character version
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