Ben Ashton
1 year ago
2 changed files with 5055 additions and 0 deletions
@ -0,0 +1,55 @@
|
||||
import { readFileSync } from 'node:fs'; |
||||
|
||||
const input = readFileSync('input', 'utf-8'); |
||||
|
||||
const numbers = input |
||||
.split('\n') |
||||
.filter(line => !!line.trim()) |
||||
.map(num => parseInt(num)); |
||||
|
||||
function getNextPos(pos, move, len) { |
||||
if (move === 0) { |
||||
return pos; |
||||
} else if (move > 0) { |
||||
return (pos + move) % (len - 1); |
||||
} else { |
||||
return (len - 1) - ((len - 1 - pos + Math.abs(move)) % (len - 1)); |
||||
} |
||||
} |
||||
|
||||
function mix(numberArray, count=1) { |
||||
const sequence = numberArray.map((move, sequence) => ({move, sequence})); |
||||
|
||||
for (let c = 0; c < count; c++) { |
||||
for (let i = 0; i < sequence.length; i++) { |
||||
const itemIndex = sequence.findIndex(item => item.sequence === i); |
||||
const item = sequence[itemIndex]; |
||||
|
||||
const newIndex = getNextPos(itemIndex, item.move, sequence.length); |
||||
|
||||
sequence.splice(itemIndex, 1); |
||||
sequence.splice(newIndex, 0, item); |
||||
} |
||||
} |
||||
|
||||
return sequence.map(s => s.move); |
||||
} |
||||
|
||||
function getCoordinates(mixed) { |
||||
const zeroIndex = mixed.indexOf(0); |
||||
const coordinates = ( |
||||
mixed[(zeroIndex + 1000) % (mixed.length)] + |
||||
mixed[(zeroIndex + 2000) % (mixed.length)] + |
||||
mixed[(zeroIndex + 3000) % (mixed.length)] |
||||
); |
||||
return coordinates; |
||||
} |
||||
|
||||
const partOneMixed = mix(numbers); |
||||
const partOneCoords = getCoordinates(partOneMixed); |
||||
console.log('The sum of grove coordinates for part one is:', partOneCoords); |
||||
|
||||
const partTwoNumbers = numbers.map(n => n * 811589153); |
||||
const partTwoMixed = mix(partTwoNumbers, 10); |
||||
const partTwoCoords = getCoordinates(partTwoMixed); |
||||
console.log('The sum of grove coordinates for part two is:', partTwoCoords); |
Loading…
Reference in new issue