Nope, it's not easy. A grid of 20x20 squares is already considered hard by regular players because we have to keep in mind several possible intersections between possible solutions.
Column norms of a matrix
Back to basics 22 - Rotate a matrix
Return the Fibonacci Sequence
Given n, create n random numbers such that their standard deviation is also n.
Still more miles to go before I sleep
Solve the picross! (Hard)
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