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As LanX pointed out, you need to convert the bottom-up "Who is my boss" structure into a top-down "Who are my subordinates" structure, then print the resulting tree.

For example:

use 5.010; use strict; use warnings; # Generalized sample input data (i.e. multiple top-level groups, # each with multiple independent bosses)... my %org_chart = ( '1929' => { '3' => { 'name' => 'Amy', 'boss' => 1929, }, '4425' => { 'name' => 'Dwight', 'boss' => 1 }, '480' => { 'name' => 'Fry', 'boss' => 2 }, '1919' => { 'name' => 'Bender', 'boss' => 2, }, '1929' => { 'name' => 'Professor', 'boss' => 0 }, '3968' => { 'name' => 'Cubert', 'boss' => 1929, }, '1' => { 'name' => 'Hermes', 'boss' => 1929, }, '4' => { 'name' => 'Zoidberg', 'boss' => 1 }, '2' => { 'name' => 'Leela', 'boss' => 1 }, }, '666' => { '666' => { 'name' => 'Satan', 'boss' => 0 }, '1' => { 'name' => 'Beelzebub', 'boss' => 666 }, '777' => { 'name' => 'Lucky', 'boss' => 1 }, '99' => { 'name' => 'Damien', 'boss' => 666 }, '333' => { 'name' => 'Satan Jr', 'boss' => 0 }, '11' => { 'name' => 'Unlucky', 'boss' => 333 }, } ); # Convert each top-level group into a tree of subordinates... for my $group (values %org_chart) { for my $employee (keys %{$group}) { # Who is this employee's boss??? my $boss = $group->{$employee}{boss}; # Nothing to do if employee doesn't have a boss... next if $boss == 0; # Record that this employee is a subordinate of their boss... push @{$group->{$boss}{subordinates}}, $group->{$employee}; } } # Draw each group's org-chart (horizontally), # starting with boss-less employees... for my $group (values %org_chart) { for my $employee (values %{$group}) { # Ignore employees who have a boss... next if $employee->{boss}; # Draw the org chart for employees that don't have a boss... draw_chart($employee); } # Draw gap between groups... say ""; } # Draw each employee and their subordinates tree... sub draw_chart { my ($root_node, $level) = @_; $level //= 0; # Report the employee... say " |" x $level, "-> ", $root_node->{name}; # Recursively report their subordinates... for my $subordinate (@{$root_node->{subordinates}}) { draw_chart($subordinate, $level+1); } }

In reply to Re: out of order tree generation by TheDamian
in thread out of order tree generation by adambot

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