Advent of Code: 2024 Day 5 / Jo Wood

Professor of Visual Analytics interested in design, geovisualization, visual storytelling and computational thinking.

Public

Edited

Dec 7

Paused

function parse(input) {

const [order, page] = input.split("\n\n");

const orders = order.split("\n").reduce((map, d) => {

const [p1, p2] = d.split("|").map(Number);

map.set(p1, [...(map.get(p1) || []), p2]);

return map;

}, new Map());

const pages = page.split("\n").map((d) => d.split(",").map(Number));

return [orders, pages];

}

function sort(update, orders) {

return [...update].sort((a, b) => (orders.get(b)?.includes(a) ? 1 : -1));

}

function isValid(update, orders) {

return AOC.equalArrays(update, sort(update, orders));

}

function midSum(updates) {

return d3.sum(updates.map((d) => d[Math.floor(d.length / 2)]));

}

function part1(input) {

const [orders, updates] = parse(input);

return midSum(updates.filter((d) => isValid(d, orders)));

}

function part2(input) {

const [orders, updates] = parse(input);

const invalid = updates.filter((d) => !isValid(d, orders));

return midSum(invalid.map((d) => sort(d, orders)));

}

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