Online Algorithms with Lookaround

09/14/2021

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by   Amirreza Akbari, et al.

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We introduce a new model of computation: the online LOCAL model (OLOCAL). In this model, the adversary reveals the nodes of the input graph one by one, in the same way as in classical online algorithms, but for each new node the algorithm can also inspect its radius-T neighborhood before choosing the output; instead of looking ahead in time, we have the power of looking around in space. It is natural to compare OLOCAL with the LOCAL model of distributed computing, in which all nodes make decisions simultaneously in parallel based on their radius-T neighborhoods.