Be careful, I've implemented the sieve, but not all versions of it are sufficiently fast to handle the biggest numbers in the test suite.
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This doesn't use primes(x),but still feels a little like cheating.
The whole point of using the sieve is not knowing which numbers are prime. So it is no different than sum(primes).
Find common elements in matrix rows
Check if sorted
Tell me the slope
Back to basics 14 - Keywords
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Find files with extension ext in the current directory
Two functions (to be sure)
Decrypt the cypher using XOR encryption (for beginners)
How to reverse spdiags?
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