See my function "seqle" on FileExchange. It may not be as compact, but it's easy to use and both encodes and decodes.
The problem statement would have been clearer if the principle of RLE had been explained with an encoding example first. Alternatively, it would have been useful to explicitly mention that the data in vector x is being read pairwise.
ugly but more fun than loops!
note: repelem did not exist back when this problem was created
not limited to 1-9
This is my favourite
Best score without regexp
Project Euler: Problem 8, Find largest product in a large string of numbers
Find the sum of the elements in the "second" diagonal
Find perfect placement of non-rotating dominoes (easier)
Determine Whether an array is empty
Getting the indices from a matrix
Find the longest sequence of 1's in a binary sequence.
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