What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Find the numeric mean of the prime numbers in a matrix.
Find the two most distant points
Right and wrong
Number of 1s in a binary string
Divisors for big integer
Find files with extension ext in the current directory
Numbers spiral diagonals (Part 1)
Replicate elements in vectors
Rank of magic square (for beginners)
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