Advent of Code Leaderboard 2021Day 1: Sonar SweepDay 2: Dive!Day 3: Binary DiagnosticDay 4: Giant SquidDay 5: Hydrothermal VentureDay 6: LanternfishDay 7: The Treachery of WhalesDay 8: Seven Segment SearchDay 9: Smoke BasinDay 11: Dumbo OctopusDay 12: Passage PathingDay 13: Transparent OrigamiDay 14: Extended PolymerizationDay 15: ChitonDay 16: Packet DecoderDay 17: Trick ShotDay 18: Snailfish
Day 10: Syntax Scoring
part2 = d3.median(
incomplete.map((d) =>
complete(d)
.map((d) => score2.get(d))
.reduce((score, n) => score * 5 + n, 0)
)
)
score2 = new Map([[")", 1], ["]", 2], ["}", 3], [">", 4]])
complete = (line) => {
const stack = [];
for (const ch of line) {
if (pairs.has(ch))
stack.unshift(ch);
else if (pairs.get(stack[0]) === ch)
stack.shift();
}
return stack.map((d) => pairs.get(d));
}
incomplete = lines.filter((d) => !corrupt(d))
part1 = d3.sum(lines.map(corrupt).map((d) => score.get(d)))
corrupt = (line) => {
const stack = [];
for (const ch of line) {
if (pairs.has(ch))
stack.unshift(ch);
else if (pairs.get(stack[0]) === ch)
stack.shift();
else
return ch;
}
return false;
}
score = new Map([[")", 3], ["]", 57], ["}", 1197], [">", 25137]])
pairs = new Map([["[", "]"], ["(", ")"], ["{", "}"], ["<", ">"]])
lines = (which === "test" ? test : input).trim().split("\n")
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