December 10th

Gift boxes

Task

The workshop has an assembly line that helps the elves put together the gift boxes to be used on the big day.

Gifts boxes contain:

a base _ (an underscore)
sides | | (a pipe, whitespace, a pipe)
a lid ¯ (a macron)
a bow * (an asterix)

Assembling a gift box MUST happen in this order:

Stage 1: _ (base)

Stage 2: _ | | (base + sides)

Stage 3: _ | | ¯ (base + sides + lid)

Stage 4: _ | | ¯ * (base + sides + lid + bow)

You will need to inspect each box part one by one and build the boxes in the order of construction. For example, if you find a bow * in the first index it would need to be discarded. If you make it to stage 3 and then find a base _ you would ignore it and continue with the partial box you were building. Finding the 'wrong' part doesn't discard the box you're building.

Result should be the number of completed boxes.

Technically speaking, a completed box would look like this:

Sample dataset:

boxparts = [ # remember Python ignores anything after # so you CAN paste this into your editor!
'| |', # can't start with sides, discard:
'_', # a base! great, keep it: _
'*', # oh no, a bow, ignore it: _
'| |', # sides - hurrah! _ | |
'_', # a base??? noooo! start again: _
'| |', # two sides! great, keep going: _ | |
'¯', # a lid... box is looking good: _ | | ¯
'*' # phew - a bow! We made a box: _ | | ¯ *
]

Full dataset:

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