math & informatics teacher
function parse(input) {
return input.split("\n").map((line) => {
const matches = line.match(/Card\s+(\d+):\s+([\d\s]+)\|\s+([\d\s]+)/);
return {
id: Number(matches[1]),
win: new Set(matches[2].split(/\s+/).map(Number)),
nums: new Set(matches[3].split(/\s+/).map(Number))
};
});
}
function scoreCards(cards) {
return cards.reduce((total, card) => {
const matches = AOC.intersection(card.win, card.nums).size;
return total + (matches ? 2 ** (matches - 1) : 0);
}, 0);
}
function part1(input) {
return scoreCards(parse(input));
}
function newIds(card, maxId) {
return d3.range(
card.id + 1,
Math.min(
card.id + 1 + AOC.intersection(card.win, card.nums).size,
maxId + 1
)
);
}
function countCards(input) {
const [fTable, maxId] = [new Map(), input.length];
for (const card of parse(input)) {
AOC.addToFreqTable(fTable, card.id);
for (const id of newIds(card, maxId)) {
AOC.addToFreqTable(fTable, id, fTable.get(card.id));
}
}
return AOC.sum([...fTable.values()]);
}
function part2(input) {
return countCards(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.
