What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Replace NaNs with the number that appears to its left in the row.
Back to basics 14 - Keywords
Rotate input square matrix 90 degrees CCW without rot90
Create a vector
Add more zeros
Chess ELO rating system
Find indices of diagonal elements
Sum of big primes without primes
Find my secret number
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