http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi - awesome forum for discussing all kinds of puzzles, algos, .. http://www.nist.gov/dads/ - data structures dictionary http://www.stanford.edu/~blp/avl/libavl.html/index.html - excellent reference for Trees http://linux.wku.edu/~lamonml/algor/ - Sorting algos http://www.swox.com/gmp/manual/Algorithms.html#Algorithms - Math algos http://en.wikipedia.org/wiki/Selection_algorithm#Linear_general_selection_algorith ms http://www.iti.fh-flensburg.de/lang/algorithmen/pattern/bmen.htm - String matching algo http://acm.mipt.ru/judge/bin/problems.pl - EL judge http://www.fearme.com/misc/alg/node194.html - all DS and algo