diff --git a/2025/05/README.md b/2025/05/README.md new file mode 100644 index 0000000..3e6feab --- /dev/null +++ b/2025/05/README.md @@ -0,0 +1,45 @@ +# Day 5: Cafeteria + +[https://adventofcode.com/2025/day/5](https://adventofcode.com/2025/day/5) + +## Description + +### Part One + +As the forklifts break through the wall, the Elves are delighted to discover that there was a cafeteria on the other side after all. + +You can hear a commotion coming from the kitchen. "At this rate, we won't have any time left to put the wreaths up in the dining hall!" Resolute in your quest, you investigate. + +"If only we hadn't switched to the new inventory management system right before Christmas!" another Elf exclaims. You ask what's going on. + +The Elves in the kitchen explain the situation: because of their complicated new inventory management system, they can't figure out which of their ingredients are _fresh_ and which are spoiled. When you ask how it works, they give you a copy of their database (your puzzle input). + +The database operates on _ingredient IDs_. It consists of a list of _fresh ingredient ID ranges_, a blank line, and a list of _available ingredient IDs_. For example: + + 3-5 + 10-14 + 16-20 + 12-18 + + 1 + 5 + 8 + 11 + 17 + 32 + + +The fresh ID ranges are _inclusive_: the range `3-5` means that ingredient IDs `3`, `4`, and `5` are all _fresh_. The ranges can also _overlap_; an ingredient ID is fresh if it is in _any_ range. + +The Elves are trying to determine which of the _available ingredient IDs_ are _fresh_. In this example, this is done as follows: + +* Ingredient ID `1` is spoiled because it does not fall into any range. +* Ingredient ID `5` is _fresh_ because it falls into range `3-5`. +* Ingredient ID `8` is spoiled. +* Ingredient ID `11` is _fresh_ because it falls into range `10-14`. +* Ingredient ID `17` is _fresh_ because it falls into range `16-20` as well as range `12-18`. +* Ingredient ID `32` is spoiled. + +So, in this example, _`3`_ of the available ingredient IDs are fresh. + +Process the database file from the new inventory management system. _How many of the available ingredient IDs are fresh?_ diff --git a/2025/05/input b/2025/05/input new file mode 100644 index 0000000..52c0659 --- /dev/null +++ b/2025/05/input @@ -0,0 +1,1180 @@ +124495185257650-128523382238124 +11529515560599-14764568063191 +413219263784594-421133392130660 +115403151906587-115766841588429 +111273823867195-112047960487389 +525066780914687-528832067150866 +434267511100474-437621416763361 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