/**
 * This code sloves the problem with gin in rooms.
 */
const GIN_IN_ROOM = true;
const GIN_NOT_IN_ROOM = false;

function generateRooms(length, fillWith) {
  return Array.apply(null, Array(length)).map(_ => fillWith);
}

function moveGin(rooms) {
  let resultRooms = generateRooms(rooms.length, GIN_NOT_IN_ROOM);

  for (let i = 0, total = rooms.length - 1; i <= total; i++) {
    if (rooms[i] === GIN_IN_ROOM) {
      if (i > 0) resultRooms[i - 1] = GIN_IN_ROOM;
      if (i < total) resultRooms[i + 1] = GIN_IN_ROOM;
    }
  }

  return resultRooms;
}

function openRoom(rooms, roomIndex) {
  rooms[roomIndex] = GIN_NOT_IN_ROOM;

  return moveGin(rooms);
}

function isGinGone(rooms) {
  return rooms.every(room => room === GIN_NOT_IN_ROOM);
}

function main(numberOfRooms) {
  let rooms = generateRooms(numberOfRooms, GIN_IN_ROOM);
  let totalSteps = 0;

  for (let i = 1; i < numberOfRooms - 1; i++) {
    rooms = openRoom(rooms, i);
    totalSteps++;
  }

  for (let i = numberOfRooms - 2; i >= 1; i--) {
    rooms = openRoom(rooms, i);
    totalSteps++;
  }

  console.log(isGinGone(rooms) ? 'done' : 'error');
  console.log('Total: ' + totalSteps);
}