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(defun range (x y)
  (let ((start (min x y)) (end (max x y)))
    (loop for i from start to end
          collect i)))

(defun primep (num)
  (cond
    ((<= num 1) nil)
    ((= num 2) t)
    (t

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use itertools::Itertools;

pub fn lexo_next(num: usize) -> usize {
    let digits = digits(num);

    let mut perms = digits
        .iter()
        .permutations(digits.len())
        .map(number)
        .filter(|perm| *perm != num)

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pub type Grid = Vec<Vec<u8>>;

pub fn grid_perimeter(grid: Grid) -> usize {
    grid.iter()
        .enumerate()
        .map(|(i, row)| {
            row.iter()
                .enumerate()
                .filter_map(|(j, cell)| if *cell == 1 { Some(j) } else { None })
                .map(|j| {

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def island_perimeter(grid):
    perimeter = 0
    for i in range(len(grid)):
        row = grid[i]
        for j in range(len(row)):
            cell = grid[i][j]

            if cell != 1:
                continue

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fn is_isomorphic(s1: &str, s2: &str) -> bool {
    let mask1 = str_mask(s1);
    let mask2 = str_mask(s2);

    mask1 == mask2
}

fn str_mask(s: &str) -> Vec<usize> {
    s.chars()
        .fold((None, Vec::<usize>::new()), |(last_c, mut acc), curr_c| {

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function faultyKeeb(str: string): string {
  const out = [];
  const vowels = ["a", "e", "i", "o", "u"];
  for (const ch of str) {
    if (vowels.includes(ch)) {
      out.reverse();
    } else {
      out.push(ch);
    }
  }

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export class LaunchControl {
  private serverUrl: string;
  private lastSessionState: "start" | "end" | null;
  private trackingId: string;

  constructor(serverUrl: string, trackingId: string) {
    this.serverUrl = serverUrl;
    this.lastSessionState = null;
    this.trackingId = trackingId;
  }

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let sum = List.fold_left (fun acc x -> acc + x) 0

type result = { pies : int; uneaten_pieces : int }

let pies pieces piece_per_pie =
  let total_pieces = sum pieces in
  let pies =
    if total_pieces mod piece_per_pie == 0 then total_pieces / piece_per_pie
    else (total_pieces / piece_per_pie) + 1
  in

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module KeyToRowMap = Map.Make (Char)

let qwertyKeyToRowMap =
  let firstRow = ['q'; 'w'; 'e'; 'r'; 't'; 'y'; 'u'; 'i'; 'o'; 'p'] in
  let secondRow = ['a'; 's'; 'd'; 'f'; 'g'; 'h'; 'j'; 'k'; 'l'] in
  let thirdRow = ['z'; 'x'; 'c'; 'v'; 'b'; 'n'; 'm'] in
    KeyToRowMap.empty 
    |> (fun m -> List.fold_left (fun acc key -> KeyToRowMap.add key 1 acc) m firstRow)
    |> (fun m -> List.fold_left (fun acc key -> KeyToRowMap.add key 2 acc) m secondRow)
    |> (fun m -> List.fold_left (fun acc key -> KeyToRowMap.add key 3 acc) m thirdRow)

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let int_sqrt x = x |> float_of_int |> sqrt |> int_of_float

(**
  * [oddSquareNumber n]
  * returns the sum of all odd square numbers less than [n]
  * 
  * it does this by going through all the odd numbers from [1] to [sqrt(n)]
  * and adding the square of each number to the sum if the square is less
  * than [n].
  *)