rkuang

def bubble_sort(prices)
  loop do
    swapped = false
    for i in 1...prices.length
      if prices[i-1] > prices[i]
        prices[i], prices[i-1] = prices[i-1], prices[i]
        swapped = true
      end
    end
    break if not swapped

rkuang

def stock_picker(prices)
  tmp_buy = 0
  min_price = prices[tmp_buy]
  max_profit = 0
  buy = -1
  sell = -1
  for i in 1...prices.length
    if min_price > prices[i]
      min_price = prices[i]
      tmp_buy = i

rkuang

dictionary = ["below","down","go","going","horn","how","howdy","it","i","low","own","part","partner","sit"]

def substrings(str, dict)
  str = str.downcase
  result = {}
  dict.each do |substring|
    scan = str.scan substring
    result[substring] = scan.length unless scan.length == 0
  end
  result

rkuang

def is_upper(ascii)
  (ascii >= 65 and ascii <= 90)
end

def is_lower(ascii)
  (ascii >= 97 and ascii <= 122)
end

def shift_char(ascii, shift)
  return ascii.chr unless is_upper(ascii) || is_lower(ascii)