About: http://webisa.webdatacommons.org/359619315

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	VN:F [1.9.22_1171] 0 Reply ???Report user CodeSCV January 19, 2013 at 8:40 pm here is a solution that do not use recursion and solves it in o(length(x)) time.
http://www.w3.org/ns/prov#wasQuotedFrom	leetcode.com