Average-energy games
Patricia Bouyer (LSV - CNRS, ENS Cachan - France), Nicolas Markey, (LSV - CNRS, ENS Cachan - France), Mickael Randour (LSV - CNRS, ENS, Cachan - France), Kim G. Larsen (Aalborg University - Denmark), Simon Laursen, (Aalborg University - Denmark)

TL;DR
This paper introduces average-energy games, a new class of two-player quantitative games focusing on optimizing the long-run average of accumulated energy, with complexity results and strategy requirements.
Contribution
It defines average-energy games, analyzes their computational complexity, and explores strategies for both one-player and two-player scenarios with energy bounds.
Findings
Deciding the winner is in NP ∩ coNP and as hard as mean-payoff games.
Memoryless strategies are sufficient for winning.
Complexity bounds and memory requirements are established for bounded energy scenarios.
Abstract
Two-player quantitative zero-sum games provide a natural framework to synthesize controllers with performance guarantees for reactive systems within an uncontrollable environment. Classical settings include mean-payoff games, where the objective is to optimize the long-run average gain per action, and energy games, where the system has to avoid running out of energy. We study average-energy games, where the goal is to optimize the long-run average of the accumulated energy. We show that this objective arises naturally in several applications, and that it yields interesting connections with previous concepts in the literature. We prove that deciding the winner in such games is in NP inter coNP and at least as hard as solving mean-payoff games, and we establish that memoryless strategies suffice to win. We also consider the case where the system has to minimize the average-energy while…
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