math & informatics teacher
function parse(input) {
const games = {};
for (const game of input.split("\n")) {
const [gameTxt, cubeTxt] = game.split(": ");
const id = gameTxt.split(" ")[1];
games[id] = cubeTxt.split("; ").map((round) =>
round.split(", ").reduce((acc, cube) => {
const [n, clr] = cube.split(" ");
acc[clr] = (acc[clr] || 0) + Number(n);
return acc;
}, {})
);
}
return games;
}
function possibleGames(games) {
const [minR, minG, minB] = [12, 13, 14];
const notAbove = (x, cap) => x === undefined || x <= cap;
return Object.entries(games).reduce((total, [id, game]) => {
const possible = game.every(
(round) =>
notAbove(round.red, minR) &&
notAbove(round.green, minG) &&
notAbove(round.blue, minB)
);
return total + (possible ? +id : 0);
}, 0);
}
function part1(input) {
return possibleGames(parse(input));
}
function minPower(games) {
let total = 0;
for (const [id, game] of Object.entries(games)) {
let [maxR, maxG, maxB] = [0, 0, 0];
for (const round of game) {
maxR = d3.max([round.red, maxR]);
maxG = d3.max([round.green, maxG]);
maxB = d3.max([round.blue, maxB]);
}
total += maxR * maxG * maxB;
}
return total;
}
function part2(input) {
return minPower(parse(input));
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
