SOFSEM 2015: Theory and Practice of Computer Science 41st International Conference on Current Trends in Theory and Practice of Computer Science, Pec pod Sněžkou, Czech Republic, January 24-29, 2015. Proceedings - Italiano, Giuseppe F.; Margaria-Steffen, Tiziana; Pokorný, Jaroslav; Quisquater, Jean-Jacques; Wattenhofer, Roger (Springer Berlin Heidelberg : Imprint: Springer, 2015)