From ba3676762a64d418a4d731f799e7f2655cf09bcc Mon Sep 17 00:00:00 2001
From: Seth Etter <sethetter@gmail.com>
Date: Sun, 3 Dec 2023 09:38:45 -0600
Subject: [PATCH] 2023, day03: first attempt, too low

---
 2023/day03/deno.json |   9 +++
 2023/day03/deno.lock |  37 ++++++++++++
 2023/day03/input     | 140 +++++++++++++++++++++++++++++++++++++++++++
 2023/day03/part1.ts  |  75 +++++++++++++++++++++++
 2023/day03/part2.ts  |  13 ++++
 2023/day03/puzzle.md |  40 +++++++++++++
 2023/day03/test.ts   |  24 ++++++++
 7 files changed, 338 insertions(+)
 create mode 100644 2023/day03/deno.json
 create mode 100644 2023/day03/deno.lock
 create mode 100644 2023/day03/input
 create mode 100644 2023/day03/part1.ts
 create mode 100644 2023/day03/part2.ts
 create mode 100644 2023/day03/puzzle.md
 create mode 100644 2023/day03/test.ts

diff --git a/2023/day03/deno.json b/2023/day03/deno.json
new file mode 100644
index 0000000..0928a95
--- /dev/null
+++ b/2023/day03/deno.json
@@ -0,0 +1,9 @@
+{
+  "tasks": {
+    "cache": "deno cache part1.ts part2.ts",
+    "pull": "aoc --day 3 download --overwrite",
+    "test": "deno test --watch",
+    "p1": "deno run -A part1.ts",
+    "p2": "deno run -A part2.ts"
+  }
+}
diff --git a/2023/day03/deno.lock b/2023/day03/deno.lock
new file mode 100644
index 0000000..2c1d001
--- /dev/null
+++ b/2023/day03/deno.lock
@@ -0,0 +1,37 @@
+{
+  "version": "3",
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+    "https://deno.land/std@0.208.0/fmt/colors.ts": "34b3f77432925eb72cf0bfb351616949746768620b8e5ead66da532f93d10ba2"
+  }
+}
diff --git a/2023/day03/input b/2023/day03/input
new file mode 100644
index 0000000..3030b76
--- /dev/null
+++ b/2023/day03/input
@@ -0,0 +1,140 @@
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+...444.......84...#....+..........527......*351..............*......*................225..888.......806.............7......#...518.....*....
+.............*........628...............749......*976.200.....852..354...23....=........*...............................138............833..
+..........964.................................211...............................578.....986.............879......59.........................
diff --git a/2023/day03/part1.ts b/2023/day03/part1.ts
new file mode 100644
index 0000000..68f9ac2
--- /dev/null
+++ b/2023/day03/part1.ts
@@ -0,0 +1,75 @@
+if (import.meta.main) {
+  const input = (
+    await Deno.readFile("input").then((bytes) =>
+      new TextDecoder().decode(bytes),
+    )
+  ).trim();
+  console.log(answer(input));
+}
+
+type Coord = [number, number];
+
+type PartNum = {
+  num: number;
+  coords: Coord[];
+};
+
+export function answer(input: string): number {
+  const grid = input.split("\n").map((l) => l.split(""));
+  const [partNums, symbols] = getPartNumsAndSymbols(grid);
+
+  return partNums.reduce(
+    (sum, { coords, num }) =>
+      isSymbolAdjacent(coords, symbols) ? sum + num : sum,
+    0,
+  );
+}
+
+export function isSymbolAdjacent(coords: Coord[], symbols: Coord[]): boolean {
+  return coords.some(([x, y]) =>
+    adjacentCoords([x, y]).some(([ax, ay]) =>
+      symbols.some(([sx, sy]) => ax === sx && ay === sy),
+    ),
+  );
+}
+
+function adjacentCoords([x, y]: Coord): Coord[] {
+  return [
+    [x - 1, y - 1],
+    [x + 1, y + 1],
+    [x - 1, y + 1],
+    [x + 1, y - 1],
+    [x, y + 1],
+    [x, y - 1],
+    [x + 1, y],
+    [x - 1, y],
+  ];
+}
+
+function getPartNumsAndSymbols(grid: string[][]): [PartNum[], Coord[]] {
+  const isSymbol = (c: string) => !c.match(/([0-9]|\.)/);
+  const isNum = (c: string) => !!c.match(/[0-9]/);
+
+  const partNums: PartNum[] = [];
+  const symbolCoords: Coord[] = [];
+
+  for (let y = 0; y < grid.length; y++) {
+    for (let x = 0; x < grid[y].length; x++) {
+      const c = grid[y][x];
+      if (isSymbol(c)) symbolCoords.push([x, y]);
+      else if (isNum(c)) {
+        const coords: Coord[] = [];
+        let numStr = "";
+        let current = c;
+        while (current && isNum(current)) {
+          coords.push([x, y]);
+          numStr += current;
+          current = grid[y][++x];
+        }
+        partNums.push({ num: parseInt(numStr), coords });
+      }
+    }
+  }
+
+  return [partNums, symbolCoords];
+}
diff --git a/2023/day03/part2.ts b/2023/day03/part2.ts
new file mode 100644
index 0000000..5658bc9
--- /dev/null
+++ b/2023/day03/part2.ts
@@ -0,0 +1,13 @@
+if (import.meta.main) {
+  const input = (
+    await Deno.readFile("input").then((bytes) =>
+      new TextDecoder().decode(bytes),
+    )
+  ).trim();
+  console.log(answer(input));
+}
+
+export function answer(input: string): number {
+  console.log(input);
+  return 42;
+}
diff --git a/2023/day03/puzzle.md b/2023/day03/puzzle.md
new file mode 100644
index 0000000..cf71786
--- /dev/null
+++ b/2023/day03/puzzle.md
@@ -0,0 +1,40 @@
+\--- Day 3: Gear Ratios ---
+----------
+
+You and the Elf eventually reach a [gondola lift](https://en.wikipedia.org/wiki/Gondola_lift) station; he says the gondola lift will take you up to the *water source*, but this is as far as he can bring you. You go inside.
+
+It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
+
+"Aaah!"
+
+You turn around to see a slightly-greasy Elf with a wrench and a look of surprise. "Sorry, I wasn't expecting anyone! The gondola lift isn't working right now; it'll still be a while before I can fix it." You offer to help.
+
+The engineer explains that an engine part seems to be missing from the engine, but nobody can figure out which one. If you can *add up all the part numbers* in the engine schematic, it should be easy to work out which part is missing.
+
+The engine schematic (your puzzle input) consists of a visual representation of the engine. There are lots of numbers and symbols you don't really understand, but apparently *any number adjacent to a symbol*, even diagonally, is a "part number" and should be included in your sum. (Periods (`.`) do not count as a symbol.)
+
+Here is an example engine schematic:
+
+```
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
+
+```
+
+In this schematic, two numbers are *not* part numbers because they are not adjacent to a symbol: `114` (top right) and `58` (middle right). Every other number is adjacent to a symbol and so *is* a part number; their sum is `*4361*`.
+
+Of course, the actual engine schematic is much larger. *What is the sum of all of the part numbers in the engine schematic?*
+
+To begin, [get your puzzle input](3/input).
+
+Answer:
+
+You can also [Shareon [Twitter](https://twitter.com/intent/tweet?text=%22Gear+Ratios%22+%2D+Day+3+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F3&related=ericwastl&hashtags=AdventOfCode) [Mastodon](javascript:void(0);)] this puzzle.
\ No newline at end of file
diff --git a/2023/day03/test.ts b/2023/day03/test.ts
new file mode 100644
index 0000000..8bf6431
--- /dev/null
+++ b/2023/day03/test.ts
@@ -0,0 +1,24 @@
+import { assertEquals } from "https://deno.land/std@0.208.0/assert/mod.ts";
+import * as p1 from "./part1.ts";
+import * as p2 from "./part2.ts";
+
+Deno.test("part1", () => {
+  const examples = [
+    "467..114..",
+    "...*......",
+    "..35..633.",
+    "......#...",
+    "617*......",
+    ".....+.58.",
+    "..592.....",
+    "......755.",
+    "...$.*....",
+    ".664.598..",
+  ].join("\n");
+  assertEquals(p1.answer(examples), 4361);
+});
+
+Deno.test("part2", () => {
+  const examples = ["abc", "def"].join("\n");
+  assertEquals(p2.answer(examples), 42);
+});
-- 
2.51.2