part 2

2023/04/benchmark.js

@@ -1,33 +1,38 @@
-import fs from 'fs-extra';
-import { parse } from 'yaml';
-import { Bench } from 'tinybench';
-import assert from 'assert';
+import fs from "fs-extra";
+import { parse } from "yaml";
+import { Bench } from "tinybench";
+import assert from "assert";
 
-import { solution_1 } from './part1.js';
-import { solution_2 } from './part2.js';
+import { solution_1 } from "./part1.js";
+import { solution_2 } from "./part2.js";
 
-const input = fs.readFileSync('./input',{ encoding: 'utf8'});
-const solutions = parse( fs.readFileSync('./solutions.yml',{encoding:'utf8'}));
+const input = fs.readFileSync("./input", { encoding: "utf8" });
+const solutions = parse(
+  fs.readFileSync("./solutions.yml", { encoding: "utf8" })
+);
 
-const bench = new Bench({time: 10000});
+const bench = new Bench({ time: 10000 });
 
-bench.add( '1', () => {
-    assert.equal(solution_1(input),solutions[1])
-})
-.add( '2', () => {
-    assert.equal(solution_2(input),solutions[2])
-});
+bench
+  .add("1", () => {
+    assert.equal(solution_1(input), solutions[1]);
+  })
+  .add("2", () => {
+    assert.equal(solution_2(input), solutions[2]);
+  });
 
 await bench.run();
 
-bench.tasks.forEach( ({result,name}) => {
-    console.log(JSON.stringify({
-        day : 1,
-        year : 2023,
-        language: 'javascript',
+bench.tasks.forEach(({ result, name }) => {
+  console.log(
+    JSON.stringify({
+      day: 1,
+      year: 2023,
+      language: "javascript",
       part: name,
       timestamp: new Date().toISOString(),
       time: result.mean / 1000,
       persec: 1000 / result.mean,
-    }));
-})
+    })
+  );
+});

2023/04/benchmark.test.js

@@ -1,13 +1,12 @@
-import { bench, expect } from 'vitest';
-import { readFileSync } from 'fs-extra';
-import { parse } from 'yaml';
+import { bench, expect } from "vitest";
+import { readFileSync } from "fs-extra";
+import { parse } from "yaml";
 
-import { solution_1 } from './part1.js';
+import { solution_1 } from "./part1.js";
 
-const input = readFileSync('./input',{ encoding: 'utf8'});
-const solutions = parse( readFileSync('./solutions.yml',{encoding:'utf8'}));
+const input = readFileSync("./input", { encoding: "utf8" });
+const solutions = parse(readFileSync("./solutions.yml", { encoding: "utf8" }));
 
-bench( 'part 1', () => {
-    expect(solution_1(input)).toBe(solutions[1])
+bench("part 1", () => {
+  expect(solution_1(input)).toBe(solutions[1]);
 });
-

2023/04/part1.js

@@ -1,26 +1,28 @@
-import * as R from 'remeda';
+import * as R from "remeda";
 
 export const slice_and_dice = R.createPipe(
-    (l) => l.replace(/Card \d+:/,'').split('|').map(
-        segment => segment.split(' ').filter(R.identity)
-    ),
-    ([winning,mine]) => {
+  (l) =>
+    l
+      .replace(/Card \d+:/, "")
+      .split("|")
+      .map((segment) => segment.split(" ").filter(R.identity)),
+  ([winning, mine]) => {
     let seen = {};
-        winning.forEach( n => seen[n] = true );
-        let got = mine.filter( n => seen[n] ).length;
+    winning.forEach((n) => (seen[n] = true));
+    let got = mine.filter((n) => seen[n]).length;
     return got;
   },
-    (n) => n == 0 ? 0 : Math.pow(2,n-1)
+  (n) => (n == 0 ? 0 : Math.pow(2, n - 1))
 );
 
+export const get_lines = R.createPipe( (i) => i.split("\n"),
+R.compact);
+
 export function solution_1(input) {
   return R.pipe(
     input,
-        i => i.split("\n"),
-        R.compact,
-        R.map(
-            slice_and_dice
-        ),
+    get_lines,
+    R.map(slice_and_dice),
     R.sumBy(R.identity)
-    ) 
+  );
 }

2023/04/part2.js

@@ -1,5 +1,31 @@
-import * as R from 'remeda';
+import * as R from "remeda";
 
-import { } from './part1.js';
+import { get_lines } from "./part1.js";
 
-export function solution_2(input){}
+export function solution_2(input) {
+    const cards = get_lines(input);
+
+    const cards_won = cards.map(()=>1);
+    let total_won = 0;
+
+    while( cards.length ) {
+    //    console.log(cards_won);
+        let card = cards.shift();
+        const [ winning, mine  ] = card 
+      .replace(/Card \d+:/, "")
+      .split("|")
+      .map((segment) => segment.split(" ").filter(R.identity));
+
+        let seen = {};
+        winning.forEach((n) => (seen[n] = true));
+        let got = mine.filter((n) => seen[n]).length;
+
+        R.range(1,got+1).forEach( i => {
+            cards_won[i] = (cards_won[i] ?? 0 ) +cards_won[0];
+        });
+
+        total_won += cards_won.shift()??0;
+    }
+
+    return total_won;
+}

2023/04/solutions.yml

@@ -1,2 +1,2 @@
 1: 23678
-2: TODO
+2: 15455663

2023/04/test.js

@@ -1,23 +1,23 @@
-import { test, expect } from 'vitest';
-import { readFileSync } from 'fs-extra';
-import { parse } from 'yaml';
+import { test, expect } from "vitest";
+import { readFileSync } from "fs-extra";
+import { parse } from "yaml";
 
-import { solution_1, slice_and_dice } from './part1.js';
-import { solution_2 } from './part2.js';
+import { solution_1, slice_and_dice } from "./part1.js";
+import { solution_2 } from "./part2.js";
 
-const input = readFileSync('./input',{ encoding: 'utf8'});
-const example = readFileSync('./example',{ encoding: 'utf8'});
-const solutions = parse( readFileSync('./solutions.yml',{encoding:'utf8'}));
+const input = readFileSync("./input", { encoding: "utf8" });
+const example = readFileSync("./example", { encoding: "utf8" });
+const solutions = parse(readFileSync("./solutions.yml", { encoding: "utf8" }));
 
-test( 'part 1', () => {
+test("part 1", () => {
+  expect(
+    slice_and_dice("Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53")
+  ).toBe(8);
 
-    expect( slice_and_dice(
-"Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53"
-)).toBe(8);
-
-    expect( solution_1(example)).toBe(13);
-    expect( solution_1(input)).toBe(solutions['1']);
-})
-test( 'part 2', () => {
-    expect( solution_2(input)).toBe(solutions['2']);
-})
+  expect(solution_1(example)).toBe(13);
+  expect(solution_1(input)).toBe(solutions["1"]);
+});
+test("part 2", () => {
+  expect(solution_2(example)).toBe(30);
+  expect(solution_2(input)).toBe(solutions["2"]);
+});