2018 d8 p2

2018/8/part2.js

@@ -0,0 +1,24 @@
+const fs = require('fs');
+const input = fs.readFileSync('input.txt', 'utf-8').split('\n')[0].split(' ').map(Number);
+
+function parse(arr) {
+	if (arr[0] == 0) {
+		return ([2 + arr[1], arr.slice(2, 2 + arr[1]).reduce((a, b) => a + b)]);
+	}
+	let children = [];
+	let pointer = 2;
+	for (let i = 0; i < arr[0]; i++) {
+		let child = parse(arr.slice(pointer, arr.length));
+		pointer += child[0];
+		children.push(child[1]);
+	}
+	let meta = 0;
+	let indexes = arr.slice(pointer, pointer + arr[1])
+	for (let i of indexes) {
+		meta += children[i - 1] || 0;
+	}
+	return [pointer + arr[1], meta];
+}
+
+let v = parse(input)[1];
+console.log(v);

2018/README.md

@@ -6,7 +6,8 @@
 1. [js  :star: :star:](https://adventofcode.com/2015/day/5 "see puzzle")
 1. [js  :star: :star:](https://adventofcode.com/2015/day/6 "see puzzle")
 1. [js  :star: :star:](https://adventofcode.com/2015/day/7 "see puzzle")
-1. [js  :star:](https://adventofcode.com/2015/day/8 "see puzzle")
+1. [js  :star: :star:](https://adventofcode.com/2015/day/8 "see puzzle")
+1. [js  :star: :star:](https://adventofcode.com/2015/day/9 "see puzzle")
 
 # Languages Used
 ### Python
@@ -23,4 +24,5 @@
 1. [:star: :star:](https://adventofcode.com/2018/day/5 "see puzzle")
 1. [:star: :star:](https://adventofcode.com/2018/day/6 "see puzzle")
 1. [:star: :star:](https://adventofcode.com/2018/day/7 "see puzzle")
-1. [:star:](https://adventofcode.com/2018/day/8 "see puzzle")
+1. [:star: :star:](https://adventofcode.com/2018/day/8 "see puzzle")
+1. [:star: :star:](https://adventofcode.com/2018/day/9 "see puzzle")

README.md

@@ -24,8 +24,9 @@ if (advent) {
 1. [js  :star: :star:](https://adventofcode.com/2015/day/5 "see puzzle")
 1. [js  :star: :star:](https://adventofcode.com/2015/day/6 "see puzzle")
 1. [js  :star: :star:](https://adventofcode.com/2015/day/7 "see puzzle")
-1. [js  :star:](https://adventofcode.com/2015/day/8 "see puzzle")
+1. [js  :star: :star:](https://adventofcode.com/2015/day/8 "see puzzle")
+1. [js  :star: :star:](https://adventofcode.com/2015/day/9 "see puzzle")
 
 ## Languages Used
-* Python 8×:star:
-* Node JS 14×:star:
+* Python
+* Node JS