In Memoriam: Ker-I Ko (1950-2018) -- Ker-I Ko and the Study of Resource-Bounded Kolmogorov Complexity -- The Power of Self-Reducibility Selectivity, Information, and Approximation -- Who Asked Us - How the Theory of Computing Answers, QuestionsAbout Analysis -- Promise Problems on Probability Distributions -- On Nonadaptive Reductions to the Set of Random Strings and its Dense Subsets -- Computability of the Solutions to Navier-Stokes Equations via Recursive Approximation -- Automatic Generation of Structured Overviews over a Very Large Corpus of Documents -- Better Upper Bounds for Searching on a Line with Byzantine Robots -- A Survey on Double Greedy Algorithms for Maximizing Non-monotone Submodular Functions -- Sequential Location Game on Continuous Directional Star Networks -- Core Decomposition, Maintenance and Applications -- Active and Busy Time Scheduling Problem: a Survey -- A Note on the Position Value for Hypergraph Communication Situations -- An Efficient Approximation Algorithm for the Steiner Tree Problem -- A Review for Submodular Optimization on Machine Scheduling Problems -- Edge Computing Integrated with Blockchain Technologies.