Given an array of strings ... find the string which is composed of other strings in the array and is of maximum size. Ex: ["satcatratbat" , "rat", "bat", "cat", "sat", "ratbat", "ratsatcat"]. Output: "satcatratbat"

Source: http://www.quora.com/Shashank-Mani-Narayan/Cracking-The-Code/String-matching-porblem