d9 p1 sol

Author: NullDev

2025/Day_09/part_1.js

@@ -8,16 +8,18 @@ const __dirname = path.dirname(fileURLToPath(import.meta.url));
 // = Copyright (c) NullDev = //
 // ========================= //
 
-const INPUT = String(fs.readFileSync(path.join(__dirname, "input.txt"))).trim().split("\n");
+const INPUT = String(fs.readFileSync(path.join(__dirname, "input.txt")))
+ .trim().split(/\s+/).map(l => l.split(",").map(Number));
 
 const pStart = performance.now();
 
-//
-// YOUR CODE HERE
-//
-const result = "...";
+const res = INPUT.flatMap((pA, iA) =>
+ INPUT.slice(iA + 1).map((
+ pB, _, __, [x1, y1] = pA, [x2, y2] = pB,
+ ) => ((Math.abs(x1 - x2) + 1) * (Math.abs(y1 - y2) + 1))),
+).reduce((maxA, curA) => Math.max(maxA, curA), 0);
 
 const pEnd = performance.now();
 
-console.log("<DESCRIPTION>: " + result);
+console.log("LARGEST AREA OF RECTANGLES: " + res);
 console.log(pEnd - pStart);

README.md

@@ -153,6 +153,7 @@ I also tried to experiment with a couple of different things:
 - One-Liner in both [Day_05/part_1.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_05/part_1.js) and [Day_05/part_2.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_05/part_2.js)
 - Very cursed One-Liner in both [Day_06/part_1.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_06/part_1.js) and [Day_06/part_2.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_06/part_2.js)
 - One-Liner in both [Day_08/part_1.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_08/part_1.js) and [Day_08/part_2.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_08/part_2.js)
+- One-Liner in [Day_09/part_1.js](https://github.com/NullDev/Advent-of-Code/blob/master/2025/Day_09/part_1.js)
 
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