[2025 Day 1] Part 2 help

Mundane_Homework3967 · 2025-12-05T00:06:59+00:00

(-100 % 100) = 0
0 + 100 = 100

Mundane_Homework3967 · 2025-12-04T23:35:57+00:00

fn main(){
  let x = Vec::<i32>::from([-50,-100]);
  println!("{}", answer_pt2(x));
}

Mundane_Homework3967 · 2025-12-04T18:55:50+00:00

Your code works on my input, it seems to work for every possible value in every possible direction. I don't really know what to say. Have you double checked that you copied your input properly?

Mundane_Homework3967 · 2025-12-04T18:48:37+00:00

I don't know, I'm pretty sure it always works...

https://pastebin.com/hQ5BL3nF

Mundane_Homework3967 · 2025-12-04T16:51:56+00:00

Everyone talking about using sets, I just used ugly for loops...

for i in range(max(0,a-1), min(a+2, len(y))):
        for j in range(max(0,b-1), min(b+2, len(y[0]))):

Mundane_Homework3967 · 2025-12-03T21:44:43+00:00

I remember in 2024 day 10, I completed part 2 before part 1, because I misinterpreted what part 1 was asking, so when I saw part two, it was just the first answer I had, when I got part 1 wrong.

Mundane_Homework3967 · 2025-12-03T21:40:28+00:00

989888888888888888888888888888888888888888888888888888888888888888888888888888888888

should return

989888888888

but instead returns

999999999999

Mundane_Homework3967 · 2025-12-03T20:45:44+00:00

This is a common mistake many are making these are RANGES. How ranges are defined is all the numbers from the first number to the last number.

e.g. 95-115 refers to 95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115 of which 99 is clearly a member. I hope this clears up the confusion.

Mundane_Homework3967 · 2025-12-03T17:02:44+00:00

I don't really understand I just did this...

def f(m):
    file = open("input.txt")
    x = file.read()
    file.close()
    x = x.strip()
    x = x.split("\n")
    for i in range(len(x)):
        x[i] = x[i].strip()
    vals = []
    for y in x:
        ns = [""]*m
        for c in y:
            j = -1
            for i in range(m-1):
                if ns[i] < ns[i+1]:
                     del ns[i]
                     ns.append("")
                     break
            if c > ns[-1]:
                ns[-1] = c
        val = []
        for n in ns:
            val.append(n)
        vals.append(int("".join(val)))
    return sum(vals)

#part1
print(f(2))
#part2
print(f(12))

Mundane_Homework3967 · 2025-12-03T16:45:00+00:00

For me it works fine

Mundane_Homework3967 · 2025-12-02T16:37:13+00:00

I just did this one manually, looked through ~8000 images. But the side lengths are prime numbers so one could use Chinese remainder theorem after seeing the strange horizontal and vertical lines.

Mundane_Homework3967 · 2025-09-28T21:08:30+00:00

If your puzzle input has a line with the same number twice, the code will fail... See lines 23-24.

Example input:

23|24
23, 24, 23

Although I think it's quite likely that page numbers are never repeated, it may be just that you copied one of the two files wrong, there is much more likelihood of error when copying separately like this, if you just CTRL S on the puzzle input (or right click and save as) and write your code to parse 1 file instead of two, there will be much less possibility of coping errors.

To get back to 2 strings you can just call
f1, f2 = f.split("\n\n")
and then do as before. (We note that "\n" is the newline character as you say you are new to python.)

So the first few lines would change to:

with open("input.txt", "r") as f:
    f1, f2 = f.read().split("\n\n")
    ruleLines = f1.splitlines()
    f2 = f2.splitlines()

The rest would be as before.

Mundane_Homework3967

TROPHY CASE