Day 25: Full of Hot AirDay 24: Blizzard BasinDay 23: Unstable DiffusionDay 22: Monkey MapDay 21: Monkey MathDay 20: Grove Positioning SystemDay 19: Not Enough MineralsDay 18: Boiling BouldersDay 17: Pyroclastic FlowDay 16: Proboscidea VolcaniumDay 15: Beacon Exclusion ZoneDay 14: Regolith ReservoirDay 12: Hill Climbing AlgorithmDay 11: Monkey in the MiddleDay 10: Cathode-Ray TubeDay 9: Rope BridgeDay 8: Treetop Tree HouseDay 7: No Space Left On DeviceDay 6: Tuning TroubleDay 5: Supply StacksDay 4: Camp CleanupDay 3: Rucksack ReorganizationDay 2: Rock Paper ScissorsDay 1: Calorie CountingAdvent of Code Leaderboard
Day 13: Distress Signal
part2 = (sorted.indexOf(dividers[0]) + 1) * (sorted.indexOf(dividers[1]) + 1)
sorted = pairs.flat().concat(dividers).sort(compare)
dividers = [[[2]], [[6]]]
part1 = comparisons
.filter((r) => r[1] === -1)
.reduce((sum, d) => sum + d[0], 0)
comparisons = pairs.map((p, i) => [i + 1, compare(...p)])
function compare(l, r) {
if (typeof l === "number" && typeof r === "number") {
if (l < r) return -1;
if (l > r) return 1;
} else if (typeof l === "object" && typeof r === "object") {
for (const [left, right] of d3.zip(l, r)) {
const c = compare(left, right);
if (c) return c;
}
if (l.length < r.length) return -1;
if (l.length > r.length) return 1;
} else if (typeof l === "number") {
return compare([l], r);
} else {
return compare(l, [r]);
}
return 0;
}
pairs = data
.trim()
.split("\n\n")
.map((p) => p.split("\n").map(JSON.parse))
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