You could always download earlier topcoder-contests (http://www.topcoder.com http://www.topcoder.com), specifically single round matches for algorithms. They ha

You could always download earlier topcoder-contests (http://www.topcoder.com http://www.topcoder.com), specifically single round matches for algorithms. They have a time limit on 75 minutes for 3 exercises, and should keep you busy for roughly that amount of time.