= Constest problems archive =

 * '''ACM''' http://www.acm.inf.ethz.ch/ProblemSetArchive.html
 * '''IPSC''' http://ipsc.ksp.sk/
 * '''Design Fest'''  http://www.designfest.org/
 * http://www.topcoder.com
 * http://www.inf.bme.hu/contests/tasks/
 * http://acm.uva.es/problemset/
= Dictionary of Algorithms and Data Structures =
 * http://www.nist.gov/dads/