windmaomao

use std::collections::HashMap;

#[derive(Debug,Hash,PartialEq,Eq,Copy,Clone)]
struct Pos(i8, i8);

type CharMat = Vec<Vec<char>>;
type MemoHash = HashMap<String, usize>;

struct Maze {
  mat: CharMat,

windmaomao

const move = (a, b) => [a[0]+b[0], a[1]+b[1]]

// given data build a maze matrix
const buildMaze = (data) => {
  const maze = data.slice(1).split('\n')
    .map(r => r.split(''))
    
  let startPos = [0, 0], numKeys = 0
  for (let i = 0; i < maze.length; i++) {
    const row = maze[i]

windmaomao

// aoc2015-day3-part2.kt

fun part2(s: String) = evenOddGroups(s)
  .flatMap { it.scan(0, nextPos) }
  .distinct()
  .count()

windmaomao

// aoc2015-day3-evenOddGroups.kt

fun evenOddGroups(s: String) = s
  .withIndex()
  .groupBy { it.index % 2 }.values
  .map { it.map { v -> v.value }

windmaomao

// aoc2015-day3-part1.kt

fun part1(s: String) = s
  .scan(0, nextPos)
  .distinct()
  .count()
}

windmaomao

// aoc2015-day3-nextPos

private val len = 10000

fun nextPos(acc: Int, c: Char) = when(c) {
  '^' -> acc + len
  'v' -> acc - len
  '>' -> acc + 1
  '<' -> acc - 1
  else -> acc

windmaomao

// aoc2015-day2-part.kt

fun part(
  list: List<Box>,
  fn: (Int, Int, Int) -> Int
) = list
  .map { (l, w, h) -> fn(l, w, h) }
  .sum()

fun part1(list: List<Box>) = part(list, paper)

windmaomao

// aoc2015-d2-part2.kt

val paper2 = { l: Int, w: Int, h: Int ->
  val m = maxOf(l, w, h)
  (l + w + h - m) * 2 + l * w * h
}

fun part2(list: List<Box>) = list
  .map { (l, w, h) -> paper2(l, w, h) }
  .sum()

windmaomao

// aoc2015-d2-part1.kt

val paper = { l: Int, w: Int, h: Int ->
  (l * w + w * h + h * l) * 2 + 
  l * w * h / maxOf(l, w, h)
}

fun part1(list: List<Box>) = list
  .map { (l, w, h) -> paper(l, w, h) }
  .sum()

windmaomao

// aoc-2015-day2.kt

typealias Box = List<Int>

fun extractBox(s: String): Box = "\\d+".toRegex()
  .findAll(s)
  .map { it.value.toInt() }
  .toList()
}