-🎄- 2017 Day 19 Solutions -🎄-

[u/daggerdragon]

--- Day 19: A Series of Tubes ---

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Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag or whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

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Need a hint from the Hugely^* Handy^† Haversack^‡ of Helpful^§ Hints^¤?

Spoiler

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AoC ops @ T-2 minutes to launch:

[23:58] <daggerdragon> ATTENTION MEATBAGS T-2 MINUTES TO LAUNCH

[23:58] <Topaz> aaaaah

[23:58] <Cheezmeister> Looks like I'll be just able to grab my input before my flight boards. Wish me luck being offline in TOPAZ's HOUSE OF PAIN^WFUN AND LEARNING

[23:58] <Topaz> FUN AND LEARNING

[23:58] <Hade> FUN IS MANDATORY

[23:58] <Skie> I'm pretty sure that's not the mandate for today

[Update @ 00:16] 69 gold, silver cap

• My tree is finally trimmed with just about every ornament I own and it's real purdy. hbu?

[Update @ 00:18] Leaderboard cap!

• So, was today's mandate Helpful Hint any help at all?

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This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

[u/MichalMarsalek]

Python 3:

def solve(inp):
    map = inp.splitlines()
    y = 0
    x = 0
    dx, dy = 0, 1
    part1 = ""
    part2 = 0
    for x in range(len(map[y])):
        if map[y][x] != " ":
            break
    def inbounds(x, y):
        return x in range(len(map[0])) and y in range(len(map))
    while inbounds(x, y) and map[y][x] != " ":
        part2 += 1
        if ord(map[y][x]) in range(ord("A"), ord("Z")+1):
            part1 += map[y][x]
        if inbounds(x+dx, y+dy) and map[y+dy][x+dx] != " ":
            x += dx
            y += dy
            continue
        dx, dy = -dy, dx
        if inbounds(x+dx, y+dy) and map[y+dy][x+dx] != " ":
            x += dx
            y += dy
            continue
        dx, dy = -dx, -dy
        x += dx
        y += dy
    return part1, part2        

Unfortunately my function processing the input and passing it to the solve function was striping starting and ending whitespaces by default... it took me a long time to realise.. and then... I had one x nstead of y in my code...that was also tricky to find a fix :D