Part 1

In [1]:

    

function process_stream(s)
    i = 1
    garbage = false
    garbage_total = 0
    group_level = 0
    group_score = 0
    while i <= endof(s)
        c = s[i]
        if c == '!'
            i += 1
        elseif garbage && c == '>'
            garbage = false
        elseif !garbage && c == '<'
            garbage = true
        elseif !garbage            
            if c == '{'
                group_level += 1                
            elseif c == '}'
                group_score += group_level
                group_level -= 1
            end
        else
            garbage_total += 1
        end
        i += 1
    end
    group_score, garbage_total
end


    

    
Out[1]:





process_stream (generic function with 1 method)

In [2]:

    

process_stream("{{<ab>},{<ab>},{<ab>},{<ab>}}")


    

    
Out[2]:





(9, 8)

In [3]:

    

process_stream("{{<a!>},{<a!>},{<a!>},{<ab>}}")


    

    
Out[3]:





(3, 17)

In [4]:

    

process_stream("<{o\"i!a,<{i<a>")


    

    
Out[4]:





(0, 10)

In [5]:

    

open("inputs/day9.txt") do fd
    score = process_stream(readstring(fd))
end


    

    
Out[5]:





(12396, 6346)

In [ ]: