Technically, L1 & L2 are line segments, and L3 & L4 are polylines.
Number of Circles in a Number
Make a run-length companion vector
Rotate input square matrix 90 degrees CCW without rot90
matrix of natural number
Do the line-segments intersect?
Formatting currency numbers
Is this group simply connected?
Frobenius McNugget Factorization
Find an inscribed square on a closed curve
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