Difficult to be more accurate.
Encode Roman Numerals
Find the two-word state names
The Tower of Hanoi
Back to basics 19 - character types
Decrypt the cypher using XOR encryption (for beginners)
Permute diagonal and antidiagonal
Pandigital number n°2 (Inspired by Project Euler 32)
Divisors for big integer
How to reverse spdiags ?
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