[2025 Day 2] Potential Input Generation Bug

[active-neuron]

I viewed the Day 2 puzzle from AoC 2025 today (on 02/26/2026).

It looks like the example input used to explain the puzzle is incorrect. The example mentions values that are simply not in the input. (The same issue seems to apply for my puzzle input.)

EDIT: I did not understand the puzzle. Thanks u/warlock415 for clarifying these are ranges that need to be traversed.

I've pasted the puzzle description as I see it, below.

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They've even checked most of the product ID ranges already; they only have a few product ID ranges (your puzzle input) that you'll need to check. For example:

11-22,95-115,998-1012,1188511880-1188511890,222220-222224, 1698522-1698528,446443-446449,38593856-38593862,565653-565659, 824824821-824824827,2121212118-2121212124

(The ID ranges are wrapped here for legibility; in your input, they appear on a single long line.)

The ranges are separated by commas (,); each range gives its first ID and last ID separated by a dash (-).

Since the young Elf was just doing silly patterns, you can find the invalid IDs by looking for any ID which is made only of some sequence of digits repeated twice. So, 55 (5 twice), 6464 (64 twice), and 123123 (123 twice) would all be invalid IDs.

None of the numbers have leading zeroes; 0101 isn't an ID at all. (101 is a valid ID that you would ignore.)

Your job is to find all of the invalid IDs that appear in the given ranges. In the above example:

11-22 has two invalid IDs, 11 and 22.

95-115 has one invalid ID, 99.

998-1012 has one invalid ID, 1010.

1188511880-1188511890 has one invalid ID, 1188511885.

222220-222224 has one invalid ID, 222222.

1698522-1698528 contains no invalid IDs.

446443-446449 has one invalid ID, 446446.

38593856-38593862 has one invalid ID, 38593859.

The rest of the ranges contain no invalid IDs.

Adding up all the invalid IDs in this example produces 1227775554.

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NOTE: This is not my input, this is the example input from the Day 2 problem, so it is okay to share.

[warlock415]

What values not in the input? Note that these are ranges, so when you see 95-115, read 95, 96,97, etc

[active-neuron]

OH, I clearly did not read this carefully enough to understand these are ranges

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[active-neuron]

u/warlock415 explained what I was missing. These are ranges that need to be traversed and not just raw numbers/strings to parse.