end of day 3

README.md

@@ -1,8 +1,7 @@
 ## Advent of Code 2025
 
-At the suggestion of a co-worker, I'm participating in the Advent of Code for 2025, and thiss repo will have my solutions.
+At the suggestion of a co-worker, I'm participating in the Advent of Code for 2025, and this repo will have my solutions.
 
 While I plan to do some of these in different languages, I'm 2 days in and so far, it's 100% JavaScript (my preferred language over the decade or so, and the one I work in the most).
 
 Each day should have instructions for running it. Fopr the JS stuff, it's node 22 with no special packages.
-

day02/notes.md

@@ -8,6 +8,6 @@ It only took about 30 minutes to solve first part, but my answer involved litera
 
 ```
 cd js
-node day01a.js
+node day02a.js
-node day01b.js
+node day02b.js
 ```

day03/input.txt

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day03/js/day03a.js

@@ -0,0 +1,43 @@
+import { promises as fsp } from "node:fs";
+
+async function asyncReadFile(filename) {
+    try {
+        const contents = await fsp.readFile(filename, "utf-8");
+
+        return contents.trim();
+    } catch (err) {
+        console.error(err);
+    }
+}
+
+const findHighestOutput = (bank) => {
+    let arr = Array.from(bank);
+    let highest = 0;
+    arr.forEach((val, idx) => {
+        if (arr.length === idx + 1) return;
+        for (let i = idx + 1; i < arr.length; i++) {
+            const output = `${val}${arr[i]}` * 1;
+            if (output > highest) highest = output;
+        }
+    });
+    console.log(highest);
+    return highest;
+};
+
+/*
+const dataToParse = `987654321111111
+811111111111119
+234234234234278
+818181911112111`;
+*/
+
+const dataToParse = await asyncReadFile("../input.txt");
+
+const banks = dataToParse.split("\n");
+let total = 0;
+
+banks.forEach((bank) => {
+    total += findHighestOutput(bank);
+});
+
+console.log(`Total: ${total}`);

day03/notes.md

@@ -0,0 +1,14 @@
+## Day 3: Lobby
+
+I had an idea for a solution to the first puzzle pretty quickly, and implemented it straightaway.
+
+But it was also brute force - literally stepping through each possible combination until I knew which one was best. This worked fine when only finding for a match, but the twist of the second puzzle made it... _impractical_ (and don't think I didn't try).
+
+ATM (11:30p Wed), I've got an algorithm that tries to create the highest value number by pulling out numbers in reverse numerical order, but it isn't _quite_ working. My current hope is to come at it fresh tomorrow when I also tackle puzzle 4.
+
+### JS Solutions
+
+```
+cd js
+node day03a.js
+```