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Corvus they/them :!marseycorvus: Stark Raven Mad :marseycorvus:  2yr ago (text post) 601 thread views #128909

Advent of Code Day 5, AKA Stacks 101 :marseyinabox:

I actually stayed up to get a semi-decent score for once (being a eurocel for this is suffering). How are you all faring with shifting boxes around?

![](/images/16702184438592093.webp)

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import math
file = open("input.txt")
stack = [[],[],[],[],[],[],[],[],[]]
stack2 =  [[],[],[],[],[],[],[],[],[]]
lines = file.readlines()
stacks = lines[0:8]
cmds = lines[10:]
for i in range(0,8):
    line = stacks[7-i]
    for j in range(1, 37, 4):
        if j > 33:
            break;
        if line[j].isalpha():
            stack[math.ceil(j/4)-1].append(line[j])
            stack2[math.ceil(j/4)-1].append(line[j])
for line in cmds:
    line = line.rstrip().split()
    c_f_t = [line[1], line[3], line[5]]
    for i in range(0, int(c_f_t[0])):
        stack[int(c_f_t[2])-1].append(stack[int(c_f_t[1])-1].pop())
    l = len(stack2[int(c_f_t[1])-1])-1
    to_append = stack2[int(c_f_t[1])-1][l-i:]
    for i in to_append:
        stack2[int(c_f_t[2])-1].append(i)
    stack2[int(c_f_t[1])-1]= stack2[int(c_f_t[1])-1][:-int(c_f_t[0])]
print(stack)
print(stack2)

I'll definitely have to clean this one up, I got flustered and started band aiding everything together because i had to get back to work

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Instead of cleaning it up, have this technically-only-12-lines (((compact))) version instead

import math, copy
stack = [[],[],[],[],[],[],[],[],[]]
lines = open("input.txt").readlines()
stacks = lines[0:8]
cmds = lines[10:]
[stack[math.ceil(j/4)-1].append(stacks[7-i][j]) for i in range(0,8) for j in range(1, 37, 4) if stacks[7-i][j].isalpha() ]
stack2 = copy.deepcopy(stack)
for line in cmds:
    for i in range(0, int(line.rstrip().split()[1])): stack[int(line.rstrip().split()[5])-1].append(stack[int(line.rstrip().split()[3])-1].pop())       
    for i in stack2[int(line.rstrip().split()[3])-1][len(stack2[int(line.rstrip().split()[3])-1])-1-i:]: stack2[int(line.rstrip().split()[5])-1].append(i)     
    stack2[int(line.rstrip().split()[3])-1]= stack2[int(line.rstrip().split()[3])-1][:-int(line.rstrip().split()[1])]
print(stack, stack2)
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As an aside, I feel like part 2 and part 1 should have been reversed.

Why start with stacks and then enhance it by going back to arrays?

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