codefights arcade intro task 16
areSimilar https://
areSimilar https://
sudoku https://
arrayChange https://
electionsWinners https://
alternatingSums https://
add https://
sortByHeight https://
palindromeRearranging https://
addBorder https://
chessKnight https://
deleteDigit https://
differentSquares https://
centuryFromYear https://