It's seems that even if we consider that the fly is always colliding with the same train (instead of zig-zagging between trains), the results are always the same.
Times 2 - START HERE
Find relatively common elements in matrix rows
Summing Digits within Text
Celsius to Fahrenheit converter
pay it forward
singularity 2.0 (really hard)
singularity 2.0 (easier)
Spherical surface triangulation
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