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.
Distance walked 1D
Number of toolboxes?
Getting the indices from a vector
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Insert zeros into vector
fly fly away
Five steps to enlightenment
Knights and Knaves (part 2)
Spherical surface triangulation
Fastest shortest-path-finder in the west
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