Merge branch '2022-14'

2022/12/part1.js

@@ -10,7 +10,7 @@ const readInput = (...args) =>
     readFile(...args),
     (lines) => lines.split("\n"),
     R.compact, // remove last line
-    R.map((line) => line.split("").map( c => c ==='S' ? '`' : c === 'E' ? '{' : c ))
+    R.map((l) => l.split(""))
   );
 
 export const puzzleInput = readInput(import.meta.url, "input");
@@ -19,7 +19,7 @@ export const sample = readInput(import.meta.url, "sample");
 export const findStart = (topoMap) => {
   let y;
   let x = R.findIndex(topoMap, (row) => {
-    let z = row.indexOf("`");
+    let z = row.indexOf("S");
     if (z === -1) return false;
     y = z;
     return true;
@@ -27,68 +27,73 @@ export const findStart = (topoMap) => {
   return V(x, y);
 };
 
-const directions = [ [0,1], [0,-1],[1,0],[-1,0] ].map(
-    d => V(...d)
-);
+export const findEnd = (topoMap) => {
+  let y;
+  let x = R.findIndex(topoMap, (row) => {
+    let z = row.indexOf("E");
+    if (z === -1) return false;
+    y = z;
+    return true;
+  });
+  return V(x, y);
+};
+
+const directions = [
+  [0, 1],
+  [0, -1],
+  [1, 0],
+  [-1, 0],
+].map((d) => V(...d));
 
 const outOfMap = (maxX, maxY) => (loc) => {
   if (Math.min(loc.x, loc.y) < 0) return true;
   if (loc.x >= maxX) return true;
   if (loc.y >= maxY) return true;
   return false;
-}
+};
 
 const isReachable = (topoMap, pos) => {
   const baseline = topoMap[pos.x][pos.y].charCodeAt(0);
 
   return (next) => {
-       return [0,1].includes(
-        topoMap[next.x][next.y].charCodeAt(0) - baseline
-    )
-    }
-}
+    return topoMap[next.x][next.y].charCodeAt(0) - baseline <= 1;
+  };
+};
 
 function findShortestPath(topoMap) {
-
   const initial = findStart(topoMap);
   initial.steps = 0;
-    initial.beenThere = [];
+  const final = findEnd(topoMap);
+
+  topoMap = topoMap.map((line) =>
+    line.map((c) => c.replace("S", "a").replace("E", "z"))
+  );
 
   const potentials = [initial];
 
-    let bestSoFar;
+  const beenThere = topoMap.map((line) => line.map(() => 9999));
 
   const oom = outOfMap(topoMap.length, topoMap[0].length);
 
-    let failsafe = 100000;
+  let failsafe = 10; //topoMap.length*topoMap[0].length ;
   while (potentials.length > 0) {
     //    if(! failsafe--) return;
-        const pos = potentials.pop(); // depth-first
-        //console.log(pos.steps, bestSoFar);
+    const pos = potentials.shift(); // depth-first
 
-        if( bestSoFar && (bestSoFar <= pos.steps) ) continue;
+    if (beenThere[pos.x][pos.y] <= pos.steps) continue;
+    beenThere[pos.x][pos.y] = pos.steps;
 
-        if( topoMap[pos.x][pos.y] === '{' ) {
-            bestSoFar = pos.steps;
-            continue;
-        }
+    const next = directions
+      .map((d) => d.clone().add(pos))
+      .filter(R.isNot(oom))
+      .filter(isReachable(topoMap, pos));
 
-        const next = directions.map(
-            d => d.clone().add(pos)
-        ).filter( R.isNot(oom ))
-         .filter( isReachable(topoMap,pos) )
-        .filter( next => !pos.beenThere.includes( next.toArray().join(',') ) );
-
-        next.forEach( n => n.steps = pos.steps + 1 );
-        next.forEach( n => n.beenThere = [
-            ...pos.beenThere, pos.toArray().join(',')
-        ] );
+    next.forEach((n) => (n.steps = pos.steps + 1));
 
     potentials.push(...next);
   }
 
-    return bestSoFar;
-
+  return beenThere[final.x][final.y];
 }
 
 export default findShortestPath;

2022/12/part2.js

@@ -1,4 +1,94 @@
 import * as R from "remeda";
+import Victor from "@a-robu/victor";
 
+import { readFile } from "../05/part1.js";
 
-export default () => {};
+const V = (x, y) => new Victor(x, y);
+
+export const findAs = (topoMap) => {
+  const locations = [];
+
+  topoMap.forEach((line, x) =>
+    line.forEach((v, y) => {
+      if (v === "a") locations.push([x, y]);
+    })
+  );
+
+  return locations;
+};
+
+export const findEnd = (topoMap) => {
+  let y;
+  let x = R.findIndex(topoMap, (row) => {
+    let z = row.indexOf("E");
+    if (z === -1) return false;
+    y = z;
+    return true;
+  });
+  return V(x, y);
+};
+
+const directions = [
+  [0, 1],
+  [0, -1],
+  [1, 0],
+  [-1, 0],
+].map((d) => V(...d));
+
+const outOfMap = (maxX, maxY) => (loc) => {
+  if (Math.min(loc.x, loc.y) < 0) return true;
+  if (loc.x >= maxX) return true;
+  if (loc.y >= maxY) return true;
+  return false;
+};
+
+const isReachable = (topoMap, pos) => {
+  const baseline = topoMap[pos.x][pos.y].charCodeAt(0);
+
+  return (next) => {
+    return baseline - topoMap[next.x][next.y].charCodeAt(0) <= 1;
+  };
+};
+
+function findShortestPath(topoMap) {
+  const final = findEnd(topoMap);
+  final.steps = 0;
+
+  topoMap = topoMap.map((line) =>
+    line.map((c) => c.replace("S", "a").replace("E", "z"))
+  );
+
+  const initial = findAs(topoMap);
+
+  const potentials = [final];
+
+  const beenThere = topoMap.map((line) => line.map(() => 9999));
+
+  const oom = outOfMap(topoMap.length, topoMap[0].length);
+
+  let failsafe = 10; //topoMap.length*topoMap[0].length ;
+  while (potentials.length > 0) {
+    //    if(! failsafe--) return;
+    const pos = potentials.shift(); // depth-first
+
+    if (beenThere[pos.x][pos.y] <= pos.steps) continue;
+    beenThere[pos.x][pos.y] = pos.steps;
+
+    const next = directions
+      .map((d) => d.clone().add(pos))
+      .filter(R.isNot(oom))
+      .filter(isReachable(topoMap, pos));
+
+    next.forEach((n) => (n.steps = pos.steps + 1));
+
+    potentials.push(...next);
+  }
+
+  return R.pipe(
+    initial,
+    R.map(([x, y]) => beenThere[x][y]),
+    R.minBy(R.identity)
+  );
+}
+
+export default findShortestPath;

2022/12/test.js

@@ -6,21 +6,23 @@ import part2 from "./part2.js";
 
 describe("part 1", () => {
   test("findStart", () => {
-        expect( findStart(sample).toArray() ).toEqual(
-            [0,0]
-        )
-
+    expect(findStart(sample).toArray()).toEqual([0, 0]);
   });
-    test( "sample", async () => {
+  test("sample", () => {
     expect(part1(sample)).toEqual(31);
   });
-  test.only("solution", () => {
-    expectSolution(part1(puzzleInput)).toEqual("TODO");
+  test("solution", () => {
+    const r = part1(puzzleInput);
+    expect(r).toBeLessThan(9999);
+    expectSolution(r).toEqual(361);
   });
 });
 
-describe("part 2", () => {
-  test.todo("solution", () => {
-    expectSolution(part2(puzzleInput)).toEqual("TODO");
+describe.only("part 2", () => {
+  test("sample", () => {
+    expect(part2(sample)).toEqual(29);
+  });
+  test("solution", () => {
+    expectSolution(part2(puzzleInput)).toEqual(354);
   });
 });

2022/13/part1.js

@@ -0,0 +1,42 @@
+import * as R from "remeda";
+
+import { readFile } from "../05/part1.js";
+
+const readInput = (...args) =>
+  R.pipe(
+    readFile(...args),
+    (lines) => lines.split("\n\n"),
+    R.compact, // remove last line
+    R.map((block) => block.split("\n").map((line) => eval(line)))
+  );
+
+export const puzzleInput = readInput(import.meta.url, "input");
+export const sample = readInput(import.meta.url, "sample");
+
+export function isLessThan(x, y) {
+  if ([x, y].every(R.isNumber)) return x < y ? -1 : x == y ? 0 : 1;
+
+  if ([x, y].every(R.isArray)) {
+    for (const [a, b] of R.zip(x, y)) {
+      const res = isLessThan(a, b);
+      if (res !== 0) return res;
+    }
+    if (x.length === y.length) return 0;
+    return x.length < y.length ? -1 : 1;
+  }
+
+  return isLessThan(...[x, y].map((z) => (R.isNumber(z) ? [z] : z)));
+}
+
+const passthru = (x) => (arg) => {
+  x(arg);
+  return arg;
+};
+
+export default R.createPipe(
+  R.map(([x, y]) => isLessThan(x, y)),
+  (results) => results.map((value, index) => ({ value, index: index + 1 })),
+  R.filter(({ value }) => value !== 1),
+  R.map(R.prop("index")),
+  (results) => results.reduce((a, b) => a + b)
+);

2022/13/part2.js

@@ -0,0 +1,14 @@
+import * as R from "remeda";
+import { isLessThan } from "./part1";
+
+const dividers = [[[2]], [[6]]];
+export default R.createPipe(
+  R.flatten,
+  R.concat(dividers),
+  (packets) => packets.sort(isLessThan),
+  (packets) =>
+    packets.map((p, i) => ({ i: i + 1, divider: dividers.includes(p) })),
+  R.filter(({ divider }) => divider),
+  R.map(R.prop("i")),
+  (v) => v.reduce((a, b) => a * b)
+);

2022/13/sample

@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]

2022/13/test.js

@@ -0,0 +1,36 @@
+import { test, expect, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import part1, { sample, puzzleInput, isLessThan } from "./part1.js";
+import part2 from "./part2.js";
+
+describe("part 1", () => {
+  test("readInput", () => {
+    expect(sample[0][0]).toEqual([1, 1, 3, 1, 1]);
+  });
+  test("lessThan", () => {
+    expect(isLessThan(1, 2)).toBe(-1);
+    expect(isLessThan(2, 1)).toBe(1);
+    expect(isLessThan(2, 2)).toBe(0);
+    expect(isLessThan(2, [1])).toBe(1);
+    expect(isLessThan([1], [2])).toBe(-1);
+  });
+  test("sample", () => {
+    expect(part1(sample)).toEqual(13);
+  });
+  test("solution", () => {
+    const r = part1(puzzleInput);
+    expect(r).toBeGreaterThan(435);
+    expect(r).toBeLessThan(10980);
+    expectSolution(r).toEqual(5806);
+  });
+});
+
+describe("part 2", () => {
+  test("sample", () => {
+    expect(part2(sample)).toEqual(140);
+  });
+  test("solution", () => {
+    expectSolution(part2(puzzleInput)).toEqual(23600);
+  });
+});

2022/14/part1.js

@@ -0,0 +1,83 @@
+import * as R from "remeda";
+import Victor from "@a-robu/victor";
+
+import { readFile } from "../05/part1.js";
+
+export const V = (...args) => new Victor(...args);
+const parseLine = (line) => line.match(/[\d,]+/g).map((x) => eval(`[${x}]`));
+
+const readInput = (...args) =>
+  R.pipe(
+    readFile(...args),
+    (lines) => lines.split("\n"),
+    R.compact, // remove last line
+    R.map(parseLine)
+  );
+
+export const puzzleInput = readInput(import.meta.url, "input");
+export const sample = readInput(import.meta.url, "sample");
+
+export function genCave(rocks) {
+  const cave = {};
+  for (const rock of rocks) {
+    const points = rock.map(Victor.fromArray);
+    let from = points.shift();
+
+    while (points.length) {
+      /** @type Victor */
+      const to = points.shift();
+      const direction = to.clone().subtract(from).normalize();
+
+      R.times(to.clone().subtract(from).length() + 1, () => {
+        if (!cave[from.y]) cave[from.y] = {};
+        cave[from.y][from.x] = "#";
+        from.add(direction);
+      });
+
+      from = to;
+    }
+  }
+  return cave;
+}
+
+function pourSand(cave) {
+  cave = R.clone(cave);
+
+  let sand = 0;
+
+  /** @type Victor */
+  let current;
+
+  const maxDepth = R.pipe(
+    cave,
+    R.keys,
+    R.map((x) => parseInt(x)),
+    R.maxBy(R.identity)
+  );
+
+  console.log({ maxDepth });
+
+  while (true) {
+    if (!current) current = V(500, 0);
+    if (current.y > maxDepth) return sand;
+
+    const next = [
+      [0, 1],
+      [-1, 1],
+      [1, 1],
+    ]
+      .map((args) => V(...args))
+      .map((v) => v.add(current))
+      .find((v) => !(cave[v.y] && cave[v.y][v.x]));
+    if (next) {
+      current = next;
+    } else {
+      if (!cave[current.y]) cave[current.y] = {};
+      cave[current.y][current.x] = "o";
+      sand++;
+      current = null;
+    }
+  }
+}
+
+export default R.createPipe(genCave, pourSand);

2022/14/part2.js

@@ -0,0 +1,53 @@
+import * as R from "remeda";
+import { genCave, V } from "./part1.js";
+
+function pourSand(cave) {
+  cave = R.clone(cave);
+
+  let sand = 0;
+
+  /** @type Victor */
+  let current;
+
+  const maxDepth =
+    R.pipe(
+      cave,
+      R.keys,
+      R.map((x) => parseInt(x)),
+      R.maxBy(R.identity)
+    ) + 1;
+
+  while (true) {
+    if (!current) current = V(500, 0);
+
+    if (current.y === maxDepth) {
+      if (!cave[current.y]) cave[current.y] = {};
+      cave[current.y][current.x] = "o";
+      sand++;
+      current = null;
+      continue;
+    }
+
+    const next = [
+      [0, 1],
+      [-1, 1],
+      [1, 1],
+    ]
+      .map((args) => V(...args))
+      .map((v) => v.add(current))
+      .find((v) => !(cave[v.y] && cave[v.y][v.x]));
+
+    if (next) {
+      current = next;
+    } else {
+      if (current.y === 0) return 1 + sand;
+
+      if (!cave[current.y]) cave[current.y] = {};
+      cave[current.y][current.x] = "o";
+      sand++;
+      current = null;
+    }
+  }
+}
+
+export default R.createPipe(genCave, pourSand);

2022/14/sample

@@ -0,0 +1,2 @@
+498,4 -> 498,6 -> 496,6
+503,4 -> 502,4 -> 502,9 -> 494,9

2022/14/test.js

@@ -0,0 +1,43 @@
+import { test, expect, describe } from "vitest";
+
+import { expectSolution } from "../01/main.js";
+import part1, { genCave, sample, puzzleInput } from "./part1.js";
+import part2 from "./part2.js";
+
+describe("part 1", () => {
+  test("readInput", () => {
+    expect(sample).toEqual([
+      [
+        [498, 4],
+        [498, 6],
+        [496, 6],
+      ],
+      [
+        [503, 4],
+        [502, 4],
+        [502, 9],
+        [494, 9],
+      ],
+    ]);
+  });
+  test("genCave", () => {
+    expect(genCave(sample)).toMatchObject({
+      4: { 498: "#" },
+    });
+  });
+  test("sample", () => {
+    expect(part1(sample)).toEqual(24);
+  });
+  test("solution", () => {
+    expectSolution(part1(puzzleInput)).toEqual(832);
+  });
+});
+
+describe.only("part 2", () => {
+  test("sample", () => {
+    expect(part2(sample)).toEqual(93);
+  });
+  test("solution", () => {
+    expectSolution(part2(puzzleInput)).toEqual(27601);
+  });
+});

_templates/day/new/part1.ejs

@@ -6,9 +6,11 @@ import * as R from "remeda";
 import { readFile } from "../05/part1.js";
 
 const readInput = (...args) =>
-  readFile(...args)
-    .split("\n")
-    .filter((x) => x);
+  R.pipe(
+    readFile(...args),
+    (lines) => lines.split("\n"),
+    R.compact, // remove last line
+  );
 
 export const puzzleInput = readInput(import.meta.url, "input");
 export const sample = readInput(import.meta.url, "sample");

_templates/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

package.json

@@ -1,4 +1,5 @@
 {
+  "type": "module",
   "name": "2022",
   "version": "1.0.0",
   "description": "",
@@ -16,6 +17,10 @@
     "memoizerific": "^1.11.3",
     "prettier": "^2.8.0",
     "remeda": "^1.3.0",
-    "vitest": "^0.25.3"
+    "vite": "^4.0.1",
+    "vitest": "0.25.7"
+  },
+  "devDependencies": {
+    "@vitest/ui": "^0.25.8"
   }
 }