Can you solve it? Do you think like a software engineer?
Summary
Today’s puzzle is a classic interview question for jobs in programming. Along the tunnel’s walls, placed uniformly and at regular intervals, are switches that can be toggled between two positions: up or down. Apart from that there are no other objects in the tunnel, and when you walk along it you can deduce nothing about the rate of curvature of the circular path. Thanks to Brian Rabern, Reader in Philosophy at the University of Edinburgh, for suggesting this puzzle, which he uses in his class “Puzzles and Paradoxes.” Finally, hard core puzzlers may be interested in the Royal Statistical Society’s Christmas Quiz (30th anniversary edition), which runs till Monday 29 January. This year’s prizes include a total of £900 in charity donations - if you can score more than 30%, a slice of the pot will be go to your nominated good cause.