[Day 25](https://adventofcode.com/2018/day/25)[Day 18](https://adventofcode.com/2018/day/18)[Day 21](https://adventofcode.com/2018/day/21)Day 19[Day 16](https://adventofcode.com/2018/day/16)[Day 13](https://adventofcode.com/2018/day/13)[Day 12](https://adventofcode.com/2018/day/12)[Day 11](https://adventofcode.com/2018/day/11)[Day 10](https://adventofcode.com/2018/day/10)[Day 9](https://adventofcode.com/2018/day/9)[Day 8](https://adventofcode.com/2018/day/8)[Day 7](https://adventofcode.com/2018/day/7)[Day 6](https://adventofcode.com/2018/day/6)[Day 5](https://adventofcode.com/2018/day/5)[Day 4](https://adventofcode.com/2018/day/4)[Day 3](https://adventofcode.com/2018/day/3)Advent of Code: [Day 2](https://adventofcode.com/2018/day/2)[Day 1](https://adventofcode.com/2018/day/1)
[Day 14](https://adventofcode.com/2018/day/14)
part1 = {
let numRecipes = Number(INPUT);
let scores = [3, 7];
let elf1 = 0;
let elf2 = 1;
while (scores.length < numRecipes + 10) {
elf1 = (elf1 + 1 + scores[elf1]) % scores.length;
elf2 = (elf2 + 1 + scores[elf2]) % scores.length;
// each recipe score is 0-9, so their sum is 0-18
// if the sum is > 9, push a 1 and then the unit digit
let newScores = scores[elf1] + scores[elf2];
if (newScores > 9) {
scores.push(1, newScores % 10);
} else {
scores.push(newScores);
}
}
return Number(scores.slice(numRecipes, numRecipes + 10).join(''));
}
function arrayEndsWith (array, subarray) {
for (let i = 1; i <= subarray.length; i++) {
if (array[array.length - i] !== subarray[subarray.length - i]) {
return false;
}
}
return true;
}
part2 = {
let target = INPUT.split('').map(Number);
let scores = [3, 7];
let elf1 = 0;
let elf2 = 1;
while (true) {
elf1 = (elf1 + 1 + scores[elf1]) % scores.length;
elf2 = (elf2 + 1 + scores[elf2]) % scores.length;
let newScores = scores[elf1] + scores[elf2];
if (newScores > 9) {
newScores = [1, newScores % 10];
} else {
newScores = [newScores];
}
for (let digit of newScores) {
scores.push(digit);
if (arrayEndsWith(scores, target)) {
return scores.length - target.length;
}
}
}
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.