math & informatics teacher
races = d3.zip(
...input
.trim()
.split("\n")
.map((l) => l.split(/\s+/).slice(1).map(Number))
)
function* options([time, distance]) {
for (let hold = 0; hold <= time; hold++)
yield { hold, speed: hold, distance: hold * (time - hold) };
}
winning = (race) =>
d3.reduce(
options(race),
(count, d) => count + (d.distance > race[1] ? 1 : 0),
0
)
part1 = races.map(winning).reduce((p, d) => p * d)
race = input
.trim()
.split("\n")
.map((l) => l.split(/\s+/).slice(1).join(""))
.map(Number)
part2 = winning(race)
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