Add day 5 solutions

day5.cr

@@ -0,0 +1,47 @@
+require "advent"
+boxes, instructions = input(2022, 5).split("\n\n")
+boxes = parse_boxes_lines(boxes.lines);
+instrs = parse_instrs(instructions.lines);
+
+def parse_instr(str)
+  _, n, _, f, _, t = str.split(" ")
+  { n.to_i64, f.to_i64, t.to_i64 }
+end
+
+def parse_instrs(lines)
+  lines.map { |l| parse_instr(l) }
+end
+
+def parse_boxes_line(str)
+  str += " "
+  str.chars.in_groups_of(4).map do |group|
+    group[1]
+  end
+end
+
+def parse_boxes_lines(lines)
+  lines.pop
+  lines = lines.map { |l| parse_boxes_line(l) }
+  lines = lines.transpose
+  lines.each do |line|
+    line.reject!(&.==(' ')).reverse!
+  end
+  lines
+end
+
+def move(from, to, n)
+  # n.times do
+  #   to << from.pop
+  # end
+  from.pop(n).each do |x|
+    next unless x 
+    to.push(x)
+  end
+end
+
+instrs.each do |instr|
+  n, f, t = instr
+  move(boxes[f-1], boxes[t-1], n)
+end
+
+puts boxes.map(&.last).join("")