Some 2015 puzzles and cleanup

Author: joshthompson

src/2015/aoc.js

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+AdventOfCode.day01 = {
+
+	part1: input => {
+		let up = input.replace(/\)/g, '').length
+		let down = input.replace(/\(/g, '').length
+		return up - down
+	},
+
+	part2: input => {
+		let floor = 0
+		let cmds = input.split('')
+		for (let i = 0; i < cmds.length; i++) {
+			floor += cmds[i] === '(' ? 1 : -1
+			if (floor === -1) return i + 1
+		}
+	}
+
+}

src/2015/day01.js

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+AdventOfCode.day02 = {
+
+	part1: input => {
+		let presents = input.split('\n').map(line => line.split('x').map(i => parseInt(i)))
+		let size = 0
+		presents.forEach(present => {
+			let w = present[0]
+			let h = present[1]
+			let l = present[2]
+			size += 2*l*w + 2*w*h + 2*h*l + Math.min(l*w, w*h, h*l)
+		})
+		return size
+	},
+	
+	part2: input => {
+		let presents = input.split('\n').map(line => line.split('x').map(i => parseInt(i)))
+		let length = 0
+		presents.forEach(present => {
+			let w = present[0]
+			let h = present[1]
+			let l = present[2]
+			let o = [w, h, l].sort((a, b) => a > b)
+			length += o[0]*2 + o[1]*2 + w*h*l
+		})
+		return length
+	}
+
+}

src/2015/day1.txt renamed to src/2015/day01.txt

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+AdventOfCode.day03 = {
+
+	part1: input => {
+		let x = 0, y = 0
+		let houses = {}
+		let gift = () => houses[x+','+y] = houses[x+','+y] ? houses[x+','+y] + 1 : 1
+		gift()
+		input.split('').forEach(cmd => {
+			if (cmd === '>') x++
+			else if (cmd === '<') x--
+			else if (cmd === 'v') y++
+			else if (cmd === '^') y--
+			gift()
+		})
+		return Object.keys(houses).length
+	},
+
+	part2: input => {
+		let sx = 0, sy = 0, rx = 0, ry = 0
+		let houses = {'0,0': 1}
+		let gift = (x, y) => houses[x+','+y] = houses[x+','+y] ? houses[x+','+y] + 1 : 1
+		input.split('').forEach((cmd, i) => {
+			if (cmd === '>')      i%2 ? sx++ : rx++
+			else if (cmd === '<') i%2 ? sx-- : rx--
+			else if (cmd === 'v') i%2 ? sy++ : ry++
+			else if (cmd === '^') i%2 ? sy-- : ry--
+			gift(i%2 ? sx : rx, i%2 ? sy : ry)
+		})
+		return Object.keys(houses).length
+	}
+
+}

src/2015/day02.js

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+AdventOfCode.day04 = {
+
+	slowWarning: true,
+
+	process: (input, start) => {
+		let hash = ''
+		let i = 0
+		do hash = md5(input + i++)
+		while (hash.substr(0, start.length) !== start)
+		return i - 1
+	},
+
+	part1: input => AdventOfCode.day04.process(input, '00000'),
+	part2: input => AdventOfCode.day04.process(input, '000000')
+
+}