Approximation, Randomization, and Combinatorial Optimization. Algorithms and Techniques (APPROX/RANDOM 2014) 17th International Workshop, APPROX 2014, and 18th International Workshop, RANDOM 2014 September 4–6, 2014, Barcelona, Spain - Jansen, Klaus; Rolim, José D.P. 1956-; Devanur, Nikhil; Moore, Cristopher (Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH, 2014)