I am way back still thinking about AOC2020#7. I have perused the 2 Essay links below, wondering if they might lead to a starting point. Would anyone care to suggest if these 2 links would be relevant? I saw a solution using graphs, but I know nothing about graphs or trees.
https://code.jsoftware.com/wiki/Essays/Tree_Display https://code.jsoftware.com/wiki/Essays/Tree_Sum Thanks, -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
