Advent of Code 2025 - Day 2
Dec 1, 2025 · 7 min read · Hi guys, today was Day 2 of AoC 2025, and boy it was fun one Puzzle 1 Deduced problem: Given a set of ranges in the form [a, b], we had to find sum of all possible invalid IDs in these ranges. Invalid ID is an ID which is made only of some sequence o...
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