Maximum triangle path sum: Difference between revisions

Here's a more FPish version with the same output. We define our own operator and the use it in the reduction metaoperator form, <tt>[op]</tt>, which turns any infix into a list operator. (We could presumably have avoided the <tt>reverse</tt> by defining our op as equivalent to a right-associative operator instead, but the reversal works too, and seems more natural in this case.)