advent-of-code-2023/src/day_two.ts

68 lines
2.1 KiB
TypeScript

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));
}