Created
December 10, 2018 17:39
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multi advent('day07', '2', Str $in) { | |
my SetHash %prereqs = parse-prereqs($in); | |
my $time = 0; | |
my @queue; | |
while %prereqs || @queue { | |
my @available = %prereqs.grep(!*.value).map(*.key).sort; | |
# Assign as many free workers to available tasks as possible. | |
while @queue < 5 && @available { | |
my $task = @available.shift; | |
@queue.push: $task => $time + 60 + ($task.ord - 'A'.ord + 1); | |
%prereqs{$task}:delete; | |
} | |
# Step forward in time and finish a task. | |
@queue.=sort(*.value); | |
(my $task, $time) = @queue.shift.kv; | |
$_{$task}-- for %prereqs.values; | |
} | |
$time | |
} |
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