What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Generate a string like abbcccddddeeeee
Dimensions of a rectangle
Find a Pythagorean triple
Compare two input matrices
Rank of magic square (for beginners)
Magic is simple (for beginners)
Numbers spiral diagonals (Part 2)
Find my secret number
Negation and new variables
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