codefights arcade intro task 24
minesweeper https://
minesweeper https://
equalPairOfBits https://
arrayReplace https://
avoidObstacles https://
sudoku https://
sumUpNumbers https://
buildPalindrome https://
findEmailDomain https://
centuryFromYear https://
boxBlur https://
alternatingSums https://
add https://
palindromeRearranging https://
areSimilar https://
isIPv4Address https://
extractEachKth https://
depositProfit https://
longestWord https://
arrayChange https://