Day 4

6 files changed, 2154 insertions, 0 deletions

diff --git a/04/.gitkeep b/04/.gitkeep
deleted file mode 100644
index e69de29..0000000
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diff --git a/04/.idea/workspace.xml b/04/.idea/workspace.xml
new file mode 100644
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diff --git a/04/README.md b/04/README.md
new file mode 100644
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+++ b/04/README.md
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+# [December 4th](https://adventofcode.com/2022/day/4)
+
+
+> Language: JavaScript
+
+## Subject
+
+### First part
+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).
+
+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?
+
+### Second part
+It seems like there is still quite a bit of duplicate work planned. Instead, the Elves would like to know the number of pairs that overlap at all.
+
+In how many assignment pairs do the ranges overlap?
+
+## Answers
+* `input-cloudburst.txt`
+    * First part: `441`
+    * Second part: `861`
+* `input-raindrops.txt`
+    * First part: `305`
+    * Second part: `811`
\ No newline at end of file
diff --git a/04/index.js b/04/index.js
new file mode 100644
index 0000000..6eb48d7
--- /dev/null
+++ b/04/index.js
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+'use strict';
+const fs = require('node:fs');
+
+for (let fileName of [ "input-cloudburst.txt", "input-raindrops.txt" ]) {
+    console.log(fileName);
+    let file = fs.readFileSync(fileName).toString().trim();
+
+    function firstPart() {
+        let containing = 0;
+        let pairs = file.split("\n").map(i => i.split(",").map(i => { return { start: parseInt(i.split("-")[0]), end: parseInt(i.split("-")[1]) } }));
+
+        for (let pair of pairs) {
+            if (
+                (pair[0]["start"] >= pair[1]["start"] && pair[0]["end"] <= pair[1]["end"]) ||
+                (pair[1]["start"] >= pair[0]["start"] && pair[1]["end"] <= pair[0]["end"])
+            ) {
+                containing++;
+            }
+        }
+
+        if (fileName === "input-example.txt") console.assert(containing === 2, "Calculated value for the example (" + containing + ") does not match expected value (2)");
+        return containing;
+    }
+
+    function secondPart() {
+        let overlapping = 0;
+
+        let pairs = file.split("\n").map(i => i.split(",").map(i => { return { start: parseInt(i.split("-")[0]), end: parseInt(i.split("-")[1]) } }));
+
+        for (let pair of pairs) {
+            if (
+                (pair[0]["start"] <= pair[1]["start"] && pair[0]["end"] >= pair[1]["start"]) ||
+                (pair[1]["start"] <= pair[0]["start"] && pair[1]["end"] >= pair[0]["start"])
+            ) {
+                overlapping++;
+            }
+        }
+
+        if (fileName === "input-example.txt") console.assert(overlapping === 4, "Calculated value for the example (" + overlapping + ") does not match expected value (4)");
+        return overlapping;
+    }
+
+    console.log("    Result: first part: " + firstPart() + "; second part: " + secondPart());
+}
\ No newline at end of file
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new file mode 100644
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\ No newline at end of file
diff --git a/04/input-raindrops.txt b/04/input-raindrops.txt
new file mode 100644
index 0000000..ee102df
--- /dev/null
+++ b/04/input-raindrops.txt
@@ -0,0 +1,1000 @@
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