From 574eee8e859d1e8da187e51c16ffc4232b78ec84 Mon Sep 17 00:00:00 2001
From: Yanick Champoux <yanick@babyl.ca>
Date: Sun, 4 Dec 2022 12:37:18 -0500
Subject: [PATCH] part 1

---
 2022/04/input     | 1000 +++++++++++++++++++++++++++++++++++++++++++++
 2022/04/part1.js  |   20 +
 2022/04/part2.js  |    2 +
 2022/04/puzzle.md |   57 +++
 2022/04/sample    |    6 +
 2022/04/test.js   |   24 ++
 6 files changed, 1109 insertions(+)
 create mode 100644 2022/04/input
 create mode 100644 2022/04/part1.js
 create mode 100644 2022/04/part2.js
 create mode 100644 2022/04/puzzle.md
 create mode 100644 2022/04/sample
 create mode 100644 2022/04/test.js

diff --git a/2022/04/input b/2022/04/input
new file mode 100644
index 0000000..6ca3e13
--- /dev/null
+++ b/2022/04/input
@@ -0,0 +1,1000 @@
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diff --git a/2022/04/part1.js b/2022/04/part1.js
new file mode 100644
index 0000000..5c5acd2
--- /dev/null
+++ b/2022/04/part1.js
@@ -0,0 +1,20 @@
+import * as R from "remeda";
+
+import { readFile } from '../03/part1.js';
+
+export const sample = readFile("2022", "04", "sample");
+export const puzzleInput = readFile("2022", "04", "input");
+
+
+const rangeLength = ([a,b]) => b-a+1;
+
+const isContainedBy = ( [a1,a2],[b1,b2] ) =>
+    ( (a1 >= b1) && (a2 <= b2) );
+
+export const solutionPart1 = R.createPipe(
+  (text) => text.split("\n"),
+  R.filter(R.identity),
+  R.map( line => line.split(',').map( range => range.split('-').map( x => parseInt(x) ) ) ),
+  R.map( R.sortBy( x => rangeLength(x) ) ),
+  R.countBy( ([a,b]) => isContainedBy(a,b) )
+);
diff --git a/2022/04/part2.js b/2022/04/part2.js
new file mode 100644
index 0000000..31477e8
--- /dev/null
+++ b/2022/04/part2.js
@@ -0,0 +1,2 @@
+import * as R from "remeda";
+
diff --git a/2022/04/puzzle.md b/2022/04/puzzle.md
new file mode 100644
index 0000000..2288234
--- /dev/null
+++ b/2022/04/puzzle.md
@@ -0,0 +1,57 @@
+\--- Day 4: Camp Cleanup ---
+----------
+
+Space needs to be cleared before the last supplies can be unloaded from the ships, and so several Elves have been assigned the job of cleaning up sections of the camp. Every section has a unique *ID number*, and each Elf is assigned a range of section IDs.
+
+However, as some of the Elves compare their section assignments with each other, they've noticed that many of the assignments *overlap*. To try to quickly find overlaps and reduce duplicated effort, the Elves pair up and make a *big list of the section assignments for each pair* (your puzzle input).
+
+For example, consider the following list of section assignment pairs:
+
+```
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
+
+```
+
+For the first few pairs, this list means:
+
+* Within the first pair of Elves, the first Elf was assigned sections `2-4` (sections `2`, `3`, and `4`), while the second Elf was assigned sections `6-8` (sections `6`, `7`, `8`).
+* The Elves in the second pair were each assigned two sections.
+* The Elves in the third pair were each assigned three sections: one got sections `5`, `6`, and `7`, while the other also got `7`, plus `8` and `9`.
+
+This example list uses single-digit section IDs to make it easier to draw; your actual list might contain larger numbers. Visually, these pairs of section assignments look like this:
+
+```
+.234.....  2-4
+.....678.  6-8
+
+.23......  2-3
+...45....  4-5
+
+....567..  5-7
+......789  7-9
+
+.2345678.  2-8
+..34567..  3-7
+
+.....6...  6-6
+...456...  4-6
+
+.23456...  2-6
+...45678.  4-8
+
+```
+
+Some of the pairs have noticed that one of their assignments *fully contains* the other. For example, `2-8` fully contains `3-7`, and `6-6` is fully contained by `4-6`. In pairs where one assignment fully contains the other, one Elf in the pair would be exclusively cleaning sections their partner will already be cleaning, so these seem like the most in need of reconsideration. In this example, there are `*2*` such pairs.
+
+*In how many assignment pairs does one range fully contain the other?*
+
+To begin, [get your puzzle input](4/input).
+
+Answer:
+
+You can also [Shareon [Twitter](https://twitter.com/intent/tweet?text=%22Camp+Cleanup%22+%2D+Day+4+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F4&related=ericwastl&hashtags=AdventOfCode) [Mastodon](javascript:void(0);)] this puzzle.
\ No newline at end of file
diff --git a/2022/04/sample b/2022/04/sample
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/2022/04/sample
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
diff --git a/2022/04/test.js b/2022/04/test.js
new file mode 100644
index 0000000..9cf5b07
--- /dev/null
+++ b/2022/04/test.js
@@ -0,0 +1,24 @@
+import { test, expect, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import {
+  solutionPart1,
+  puzzleInput,
+    sample,
+} from "./part1.js";
+import { solutionPart2 } from "./part2.js";
+
+describe("part 1", () => {
+  test("sample", () => {
+    expectSolution(solutionPart1(sample)).toEqual(2);
+  });
+  test("solution", () => {
+    expectSolution(solutionPart1(puzzleInput)).toEqual('TODO');
+  });
+});
+
+describe("part 2", () => {
+  test.todo("solution", () => {
+    expectSolution(solutionPart2(puzzleInput)).toEqual('TODO');
+  });
+});