This commit is contained in:
Lewis Dale 2023-12-02 09:30:47 +00:00
parent 578ff6d52e
commit 64a7e8fa79
6 changed files with 2312 additions and 4 deletions

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.gitignore vendored
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node_modules node_modules
inputs inputs
.idea .idea
.vscode

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day_two.test.ts Normal file
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import { calculateMinimumCubePowers, calculatePossibleGames, parseGame } from "./day_two";
const partOneInput = `Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green`
describe('Day Two', () => {
it('should parse a game', () => {
const games = partOneInput.split('\n').map(parseGame);
expect(games).toEqual([
{
id: 1,
rounds: [
{ blue: 3, green: 0, red: 4 },
{ blue: 6, red: 1, green: 2 },
{ blue: 0, red: 0, green: 2 }
]
},
{
id: 2,
rounds: [
{ blue: 1, green: 2, red: 0 },
{ blue: 4, red: 1, green: 3 },
{ blue: 1, red: 0, green: 1 }
]
},
{
id: 3,
rounds: [
{ blue: 6, green: 8, red: 20 },
{ blue: 5, red: 4, green: 13 },
{ blue: 0, red: 1, green: 5 }
]
},
{
id: 4,
rounds: [
{ blue: 6, green: 1, red: 3 },
{ blue: 0, red: 6, green: 3 },
{ blue: 15, red: 14, green: 3 }
]
},
{
id: 5,
rounds: [
{ blue: 1, green: 3, red: 6 },
{ blue: 2, red: 1, green: 2 },
]
}
]);
});
it('should calculate which games should only have been possible with the number of cubes', () => {
const games = partOneInput.split('\n').map(parseGame);
expect(calculatePossibleGames(games, {
blue: 14,
red: 12,
green: 13
})).toEqual(8);
});
it('should find the minimum cubes in a set and sum the powers of the cubes', () => {
const games = partOneInput.split('\n').map(parseGame);
expect(calculateMinimumCubePowers(games)).toEqual(2286);
});
});

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day_two.ts Normal file
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import fs from 'fs';
export type Cubes = {
blue: number;
red: number;
green: number;
}
export type Game = {
id: number;
rounds: Cubes[];
}
export const parseGame = (input: string): Game => {
const [gameId, roundsInput] = input.split(':');
const id = parseInt(gameId.split(' ')[1], 10);
const rounds = roundsInput.split(';').map(round => {
return round.trim().split(',').map(cube => cube.trim()).reduce((total, cube) => {
const [amount, color] = cube.split(' ');
total[color as keyof Cubes] = parseInt(amount, 10);
return total;
}, {blue: 0, green: 0, red: 0} as Cubes);
});
return {
id,
rounds
}
}
export const calculatePossibleGames = (games: Game[], limits: Cubes): number => {
const possibleGames = games.filter(game => {
return game.rounds.every(round => {
return Object.keys(round).every(color => {
return round[color as keyof Cubes] <= limits[color as keyof Cubes];
});
});
});
return possibleGames.reduce((total, game) => total + game.id, 0);
}
const minimumCubesRequiredForGame = (game: Game): Cubes => {
return game.rounds.reduce((total, round) => {
Object.keys(round).forEach(color => {
total[color as keyof Cubes] = Math.max(total[color as keyof Cubes], round[color as keyof Cubes]);
});
return total;
}, {blue: 0, green: 0, red: 0} as Cubes);
}
export const calculateMinimumCubePowers = (games: Game[]): number => {
const minimumCubes = games.map(minimumCubesRequiredForGame);
return minimumCubes.reduce((total, cubes) => {
return total + (cubes.blue * cubes.green * cubes.red);
}, 0);
}
export const runDayTwo = () => {
const input = fs.readFileSync('./inputs/day_two_input.txt', 'utf8').split('\n').filter(Boolean);
const games = input.map(parseGame);
const limits = {
blue: 14,
red: 12,
green: 13
};
console.log(calculatePossibleGames(games, limits));
console.log(calculateMinimumCubePowers(games));
}
runDayTwo();

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jest.config.js Normal file
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/** @type {import('ts-jest').JestConfigWithTsJest} */
module.exports = {
preset: 'ts-jest',
testEnvironment: 'node',
};

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"author": "", "author": "",
"license": "ISC", "license": "ISC",
"devDependencies": { "devDependencies": {
"@types/jest": "^29.5.10",
"@types/node": "^20.10.1", "@types/node": "^20.10.1",
"jest": "^29.7.0",
"ts-jest": "^29.1.1",
"ts-node": "^10.9.1", "ts-node": "^10.9.1",
"typescript": "^5.3.2" "typescript": "^5.3.2"
} }

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yarn.lock

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