Approximation, randomization, and combinatorial optimization. Algorithms and Techniques 19th international workshop, APPROX 2016, and 20th international workshop, RANDOM 2016, September 7-9, 2016, Paris, France - Jansen, Klaus 1961-; Mathieu, Claire; Rolim, José D.P. 1956-; Umans, Chris (LIPIcs - Leibniz International Proceedings in Informatics, 2016)