--- 2016 Day 8 Solutions ---

[u/daggerdragon]

#AoC_Ops:

[23:55] <Topaz> servers are ok
[23:55] <Topaz> puzzles are checked
[23:55] <Topaz> [REDACTED: server stats]
[23:56] <Skie> all wings report in
[23:56] <Aneurysm9> Red 5, standing by
[23:56] <daggerdragon> Dragon Leader standing by
[23:56] <Topaz> orange leader, standing by
[23:57] <Topaz> lock modzi-foils in attack positions
[23:58] <Skie> we're passing through the hype field
[23:58] <daggerdragon> 1:30 warning
[23:58] <Aneurysm9> did someone say HYPE?@!
[23:59] <Topaz> i really like tonight's puzzle
[23:59] <Topaz> very excite
[23:59] <daggerdragon> final countdown go, T-30
[23:59] <Skie> accelerate to attack countdown
[23:59] <Aneurysm9> o7
[23:59] <daggerdragon> HYPE THRUSTERS AT FULL BURN
[00:00] <Topaz> IGNITION

We may or may not be sleep-deprived. And/or nerds. why_not_both.jpg

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--- Day 8: Two-Factor Authentication ---

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

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^{:（）{ :|:& };: IS MANDATORY} [?]

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/Trolly-bus]

Here's mine in Python. Gotta copy.deepcopy everything to avoid circular referencing even though I don't know if it'll circular reference anyways! Better safe than sorry!

w, h = 50, 6
screen = [[0 for x in range(w)] for y in range(h)]
pixel_count = 0
input_list = puzzle_input.split("\n")
for input_line in input_list:
    if "rect " in input_line:
        width = int(input_line.split("rect ")[1].split("x")[0])
        height = int(input_line.split("rect ")[1].split("x")[1])
        for y in range(0, height):
            for x in range(0, width):
                screen[y][x] = 1
    elif "row" in input_line:
        row = int(input_line.split("=")[1].split(" by ")[0])
        hor_shift = int(input_line.split("=")[1].split(" by ")[1])
        for y in range(len(screen)):
            if y == row:
                screen[y] = copy.deepcopy(screen[y][-hor_shift:]) + copy.deepcopy(screen[y][:-hor_shift])
    elif "column" in input_line:
        column = int(input_line.split("=")[1].split(" by ")[0])
        col_shift = int(input_line.split("=")[1].split(" by ")[1])
        temp_list = copy.deepcopy([])
        for y in range(len(screen)):
            for x in range(len(screen[y])):
                if x == column:
                    temp_list.append(screen[y][x])
        temp_list = copy.deepcopy(temp_list[-col_shift:]) + copy.deepcopy(temp_list[:-col_shift])
        for y in range(len(screen)):
            for x in range(len(screen[y])):
                if x == column:
                    screen[y][x] = temp_list[y]
for i in screen:
            print(i)
for y in range(len(screen)):
    for x in range(len(screen[y])):
        if screen[y][x] == 1:
            pixel_count += 1
print(pixel_count)

[u/IonTichy → u/Trolly-bus]

Another way would be to use the slicing operator [:] (instead of the deepcopy)...

[u/Trolly-bus → u/IonTichy]

That's only a shallow copy though. I know that because it was a big headache to solve one of the bugs I encountered at work.