7 files changed, 2183 insertions, 0 deletions
diff --git a/aoc_2022/day-09/example.test.ts b/aoc_2022/day-09/example.test.ts
new file mode 100644
index 0000000..8fea0c3
--- /dev/null
+++ b/aoc_2022/day-09/example.test.ts
@@ -0,0 +1,33 @@
+import { expect, test } from "bun:test";
+import { main as part1 } from "./part_1";
+import { main as part2 } from "./part_2";
+
+const example = `R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2`.split("\n");
+const example2 = `R 5
+U 8
+L 8
+D 3
+R 17
+D 10
+L 25
+U 20`.split("\n");
+//const example = `1 2 3 4 5`.split(" ");
+
+test("part1", async () => {
+  const answer = 13;
+  const res = await part1(example);
+  expect(res).toEqual(answer);
+});
+
+test("part2", async () => {
+  const answer = 36;
+  const res = await part2(example2);
+  expect(res).toEqual(answer);
+});
diff --git a/aoc_2022/day-09/.gitkeep b/aoc_2022/day-09/logs/.gitkeep
index e69de29..e69de29 100644
--- a/aoc_2022/day-09/.gitkeep
+++ b/aoc_2022/day-09/logs/.gitkeep
diff --git a/aoc_2022/day-09/logs/out_1.txt b/aoc_2022/day-09/logs/out_1.txt
new file mode 100644
index 0000000..38b65db
--- /dev/null
+++ b/aoc_2022/day-09/logs/out_1.txt
@@ -0,0 +1,7 @@
+=== COMPUTATION ===
+
+
+=== /COMPUTATION ===
+
+=== ANSWER TO P1 ===
+6269
diff --git a/aoc_2022/day-09/logs/out_2.txt b/aoc_2022/day-09/logs/out_2.txt
new file mode 100644
index 0000000..419b4ad
--- /dev/null
+++ b/aoc_2022/day-09/logs/out_2.txt
@@ -0,0 +1,7 @@
+=== COMPUTATION ===
+
+
+=== /COMPUTATION ===
+
+=== ANSWER TO P2 ===
+2557
diff --git a/aoc_2022/day-09/part_1.ts b/aoc_2022/day-09/part_1.ts
new file mode 100644
index 0000000..b255aca
--- /dev/null
+++ b/aoc_2022/day-09/part_1.ts
@@ -0,0 +1,75 @@
+import { JSONSet } from "@/utils";
+
+type Point = {
+  x: number;
+  y: number;
+};
+
+const distance = (p1: Point, p2: Point) =>
+  Math.sqrt(Math.pow(p2.x - p1.x, 2) + Math.pow(p2.y - p1.y, 2));
+
+const isDiagAdj = (p1: Point, p2: Point) => distance(p1, p2) <= Math.sqrt(2);
+
+export const main = async (lines: string[]): Promise<number | string> => {
+  const knots: Point[] = Array(2)
+    .fill(null)
+    .map(() => ({ x: 0, y: 0 }));
+
+  const visited: JSONSet<Point> = new JSONSet();
+  visited.add(knots[0]);
+
+  for (const step of lines) {
+    const [dir, steps_s] = step.split(" ");
+    const steps = parseInt(steps_s);
+
+    for (let i = 0; i < steps; ++i) {
+      if (dir === "U") knots[0].y += 1;
+      if (dir === "L") knots[0].x -= 1;
+      if (dir === "R") knots[0].x += 1;
+      if (dir === "D") knots[0].y -= 1;
+
+      for (let knotidx = 1; knotidx < knots.length; knotidx++) {
+        const [head, tail] = [knots[knotidx - 1], knots[knotidx]];
+        if (!isDiagAdj(head, tail)) {
+          if (dir === "U") {
+            tail.x = head.x;
+            tail.y = head.y - 1;
+          }
+          if (dir === "L") {
+            tail.x = head.x + 1;
+            tail.y = head.y;
+          }
+          if (dir === "R") {
+            tail.x = head.x - 1;
+            tail.y = head.y;
+          }
+          if (dir === "D") {
+            tail.x = head.x;
+            tail.y = head.y + 1;
+          }
+          visited.add(tail);
+        }
+      }
+    }
+  }
+
+  return visited.size;
+};
+
+//
+
+const isrun = process.argv.length > 1 && process.argv[1] === import.meta.path;
+if (isrun) {
+  const file = Bun.file("./problem.txt");
+  const text = await file.text();
+  const lines = text.split("\n").filter((x) => x && x.length);
+
+  console.log("=== COMPUTATION ===\n");
+
+  const answer = await main(lines);
+
+  console.log("\n=== /COMPUTATION ===\n");
+
+  console.log("=== ANSWER TO P1 ===");
+  console.log(answer);
+}
diff --git a/aoc_2022/day-09/part_2.ts b/aoc_2022/day-09/part_2.ts
new file mode 100644
index 0000000..5b0df2a
--- /dev/null
+++ b/aoc_2022/day-09/part_2.ts
@@ -0,0 +1,61 @@
+import { JSONSet, Vec2, l2Norm, isDiagAdj } from "@/utils";
+
+export const main = async (lines: string[]): Promise<number | string> => {
+  const knots: Vec2[] = Array(10)
+    .fill(null)
+    .map(() => ({ x: 0, y: 0 }));
+
+  const visited: JSONSet<Vec2> = new JSONSet();
+  visited.add(knots[0]);
+
+  for (const step of lines) {
+    const [dir, steps_s] = step.split(" ");
+    const steps = parseInt(steps_s);
+
+    for (let i = 0; i < steps; ++i) {
+      if (dir === "U") knots[0].y += 1;
+      if (dir === "L") knots[0].x -= 1;
+      if (dir === "R") knots[0].x += 1;
+      if (dir === "D") knots[0].y -= 1;
+
+      for (let knotidx = 1; knotidx < knots.length; knotidx++) {
+        const [head, tail] = [knots[knotidx - 1], knots[knotidx]];
+
+        if (!isDiagAdj(head, tail)) {
+          if (head.y - tail.y === 0) {
+            tail.x += Math.floor((head.x - tail.x) / 2);
+          } else if (head.x - tail.x === 0) {
+            tail.y += Math.floor((head.y - tail.y) / 2);
+          } else {
+            tail.x += head.x - tail.x > 0 ? 1 : -1;
+            tail.y += head.y - tail.y > 0 ? 1 : -1;
+          }
+        }
+
+        if (knotidx === knots.length - 1) {
+          visited.add(tail);
+        }
+      }
+    }
+  }
+
+  return visited.size;
+};
+
+//
+
+const isrun = process.argv.length > 1 && process.argv[1] === import.meta.path;
+if (isrun) {
+  const file = Bun.file("./problem.txt");
+  const text = await file.text();
+  const lines = text.split("\n").filter((x) => x && x.length);
+
+  console.log("=== COMPUTATION ===\n");
+
+  const answer = await main(lines);
+
+  console.log("\n=== /COMPUTATION ===\n");
+
+  console.log("=== ANSWER TO P2 ===");
+  console.log(answer);
+}
diff --git a/aoc_2022/day-09/problem.txt b/aoc_2022/day-09/problem.txt
new file mode 100644
index 0000000..2b57957
--- /dev/null
+++ b/aoc_2022/day-09/problem.txt
@@ -0,0 +1,2000 @@
+L 1
+R 1
+D 1
+R 2
+D 2
+L 1
+D 1
+L 2
+R 1
+L 1
+U 1
+D 2
+R 1
+D 2
+R 1
+L 2
+D 1
+U 1
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+L 1
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+U 1
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+D 1
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+L 1
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+R 1
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