The 8th test case is correct and can be solved within Cody's time limit. Why is it not being used? Up to 200.000, there are 20 amicable pairs.
For instance 176272,180848 is the 20th pair. For 3e5 my code can't go fast enough for Cody (45s), but I've found just 2 additional pairs 196724, 202444 and 185368, 203432.
Determine whether a vector is monotonically increasing
Swap the first and last columns
Decode a simplified barcode
Compute a dot product of two vectors x and y
Rotate a matrix without using rot90
Sum of series
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