Forgot to save step 1

This commit is contained in:
John Shaver 2022-12-21 18:52:56 -08:00
parent efacb44254
commit 29804ff5c2
3 changed files with 5116 additions and 0 deletions

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const fs = require('fs/promises');
const sum = (arr) => arr.reduce((total, num) => total+num, 0);
const arrayOfLength = n => Array.from(Array(n).keys()).map(() => {});
const modulo = (n, m) => ((n % m + m) % m);
const keypress = async () => {
process.stdin.setRawMode(true)
return new Promise(resolve => process.stdin.once('data', data => {
const byteArray = [...data]
if (byteArray.length > 0 && byteArray[0] === 3) {
console.log('^C')
process.exit(1)
}
process.stdin.setRawMode(false)
resolve()
}))
}
const coords = ([x, y, z]) => `${x},${y},${z}`;
const createNode = (arr, order, first, par, i = 0) => {
const node = {
val: arr[i],
par
}
order.push(node);
if(i < arr.length - 1) {
node.next = createNode(arr, order, first || node, node, i+1)
return node;
}
first.par = node;
node.next = first;
node.last = true;
return node;
};
const print = (node, first) => node === first ? [] : [node.val, ...print(node.next, first || node)];
const key = 811589153;
const main = async () => {
const input = (await fs.readFile("./input.txt", 'utf8')).slice(0, -1).split("\n").map(x => parseInt(x) * key);
const order = [];
let head = createNode(input, order, 0);
const shiftIntoOffset = (node, offset) => {
if(offset === 0) {
return;
}
let replace = node.next;
node.par.next = replace;
replace.par = node.par;
if(node === head) {
head = node.next;
}
for(let i = 0; i < offset; ++i) {
replace = replace.next;
}
if(replace === head) {
head = node;
}
replace.par.next = node;
node.par = replace.par;
node.next = replace;
replace.par = node;
return;
}
const mix = () => {
for(let i = 0; i < order.length; i++) {
const node = order[i];
const shiftBy = modulo(node.val, input.length - 1);
if(shiftBy !== 0) {
shiftIntoOffset(node, shiftBy);
}
}
};
for(let i = 0; i < 10; ++i) {
mix();
}
console.log("Mixed!");
const getAnswer = () => {
const answer = [];
let node = order.find(x => 0 === x.val);
let i = 0;
while(answer.length < 3) {
if(i === 1000 % input.length
|| i === 2000 % input.length
|| i === 3000 % input.length
) {
answer.push(node.val);
}
node = node.next;
++i;
}
return answer;
};
console.log("Answer: ", sum(getAnswer()));
}
main();

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2022/20/input.txt Normal file

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