Advent of Code: 2020 Day 1Advent of Code: 2020 Day 2Advent of Code: 2020 Day 3Advent of Code: 2020 Day 4Advent of Code: 2020 Day 5Advent of Code: 2020 Day 6Advent of Code: 2020 Day 7Advent of Code: 2020 Day 8Advent of Code: 2020 Day 9Advent of Code: 2020 Day 11Advent of Code: 2020 Day 12Advent of Code: 2020 Day 13Advent of Code: 2020 Day 14Advent of Code: 2020 Day 15Advent of Code: 2020 Day 16Advent of Code: 2020 Day 17Advent of Code: 2020 Day 18Advent of Code: 2020 Day 19Advent of Code: 2020 Day 20Advent of Code: 2020 Day 21Advent of Code: 2020 Day 22Advent of Code: 2020 Day 23Advent of Code: 2020 Day 24Advent of Code: 2020 Day 25
Advent of Code: 2020 Day 10
function diffs(xs) {
const sorted = AOC.sort([0, ...xs]);
const ds = new Array(sorted.length - 1);
for (let i = 1; i < sorted.length; i++) {
ds[i - 1] = sorted[i] - sorted[i - 1];
}
return ds;
}
function part1(input) {
const ds = diffs(AOC.linesToNumbers(input));
return ds.filter(x => x == 1).length * (ds.filter(x => x == 3).length + 1);
}
function numPathSplits(xs) {
if (xs[0] == 1) {
switch (xs.length) {
case 1:
return 1;
case 2:
return 2;
case 3:
return 4;
case 4:
return 7;
}
} else {
return 1;
}
}
function part2(input) {
return AOC.product(
AOC.group(diffs(AOC.linesToNumbers(input))).map(numPathSplits)
);
}
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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.
