A binary monkey search algorithm variation for solving the set covering problem

Broderick Crawford, Ricardo Soto, Rodrigo Olivares, Gabriel Embry, Diego Flores, Wenceslao Palma, Carlos Castro, Fernando Paredes, José Miguel Rubio

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


In complexity theory, there is a widely studied grouping of optimization problems that belongs to the non-deterministic polynomial-time hard set. One of them is the set covering problem, known as one of Karp’s 21 NP-complete problems, and it consists of finding a subset of decision variables for satisfying a set of constraints at the minimum feasible cost. However, due to the nature of the problem, this cannot be solved using traditional complete algorithms for hard instances. In this work, we present an improved binary version of the monkey search algorithm for solving the set covering problem. Originally, this approximate method was naturally inspired by the cognitive behavior of monkeys for climbing mountains. We propose a new climbing process with a better exploratory capability and a new cooperation procedure to reduce the number of unfeasible solutions. For testing this approach, we present a detailed computational results section, where we illustrate how this variation of the monkey search algorithm is capable of reaching various global optimums for a well-known instance set from the Beasley’s OR-Library and how it outperforms many other heuristics and meta-heuristics addressed in the literature. Moreover, we add a complete statistical analysis to show the effectiveness of the proposed approach with respect to the original version.

Original languageEnglish
Pages (from-to)825-841
Number of pages17
JournalNatural Computing
Issue number4
StatePublished - 1 Dec 2020


  • Metaheuristics
  • Monkey search algorithm
  • Optimization problem
  • Parameter setting
  • Set covering problem


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