my ($stacks, $actions) = $*IN.slurp.split("\n\n");
my @stacks = $stacks.lines;
my \width = @stacks.pop.comb(/\d+/).elems;
my @S1 = [] xx (width + 1);
for @stacks».comb -> @L {
my @a = @L[1, 5 ... width * 4 - 1];
for ^width -> \j {
@S1[j+1].push(@a[j]) unless @a[j] eq ' ';
}
}
my @S2 = @S1.deepmap(*.clone);
for $actions.lines».comb(/\d+/)».Int -> (\quantity, \from, \to) {
@S1[to].unshift(@S1[from].shift) for ^quantity;
@S2[to].unshift(|@S2[from].splice(0, quantity));
}
put 'part 1: ', @S1[1..width;0].join;
put 'part 2: ', @S2[1..width;0].join;
