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.
Check if sorted
Similar Triangles - find the height of the tree
Back to basics 5 - Clipboard
Get the length of a given vector
Find out missing number from a vector of 9 elements
Spherical surface triangulation
singularity 2.0 (hard)
pay it forward
Knights and Knaves (part 3)
Knights and Knaves (part 1)
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