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Calculation in the Narrows

By Dennis E. Shasha, October 01, 2005

A puzzle beneath the waves.
October, 2005: Calculation in the Narrows 

Start:
   P0 P1 P2 P3 P4
Next:
      P1 P2 P3 P4
      P0
Next (reverse):
      P4 P3 P2 P1 P0
Next:
         P2 P1 P0
         P3 P4
Next:
     P0 P1 P2 P3 P4
Next:
            P3 P4
            P2 P1 P0
Next:
      P4 P3 P2 P1 P0
Next:
               P0
               P1 P2 P3 P4
End of round

Figure 2: List reversal.



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