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class CircularQueue {
  constructor(size) {
    this.size = size;
    this.storage = Array.from(new Array(size));
    Object.seal(this.storage);
    this.head = -1;
    this.tail = -1;
  }

  queue(value) {

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FROM node:10.14
RUN mkdir /app
WORKDIR /app
RUN npm install mongodb-memory-server@5.1.1
COPY ./index.js .
CMD node ./index.js

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const flatten = <T>(arr: T[][]): T[] => ([] as T[]).concat(...arr);

test("flatten", () => {
  expect(flatten([[1], [2], [3, 4]])).toEqual([1, 2, 3, 4]);
});

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const groupBy = <T extends { [k in K]: string }, K extends string>(
  arr: T[],
  attr: K,
) => {
  return arr.reduce<{ [k in T[K]]?: T[] }>((result, item) => {
    const k = item[attr];
    if (result[k] === undefined) {
      result[k] = [];
    }
    (result[k] as T[]).push(item);

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const uniq = <T>(arr: T[], fn: (el: T) => Object = (a) => a) =>
  arr.reduce<T[]>(
    (acc, curr) => (acc.some((a) => fn(a) === fn(curr)) ? acc : [...acc, curr]),
    [],
  );

test("uniq", () => {
  const deduped = uniq([{ a: 2 }, { a: -2 }], (el) => Math.abs(el.a));
  expect(deduped).toEqual([{ a: 2 }]);
});

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type Point = {
  $type: "PlainPoint";
  x: number;
  y: number;
};

const removeRedundantPoints = (points: Point[]) => {
  const redundantIndexes: number[] = [];

  for (let i = 0; i < points.length - 2; i++) {

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# -*- coding: utf8 -*-
from datetime import timedelta
from fabric.context_managers import settings
from fabric.contrib.files import sed, exists
from fabric.operations import sudo, run, put
from fabric.state import env


useful_software_list = [
    'htop',

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# -*- coding: utf8 -*-
import base64
import os
import tempfile
from smtpd import DebuggingServer

from json import loads, dumps


class TestSmtpServer(DebuggingServer):

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import unittest2
from django import forms


class DynamicForm(forms.Form):
    """
    Allows to alter fields amount and requireness via spec, e.g.:
        form = DynamicFormSubclass(spec={
            'last_name': False,  # Drops field from initial form
            'gender': {'required': True},

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# -*-coding: utf8 -*-
import unittest2
from zope.interface import Interface
from zope.interface.declarations import implements, classImplements


class Storage(object):
    CLASS_TEMPLATE = """
class %(class_name)s(object):
    def __init__(self, instance):