In the TREE AUGMENTATION problem the goal is to augment a tree T by a minimum size edge set F from a given edge set E such that T∪F is 2-edge-connected. The best approximation ratio known for the problem is 1.5. In the more general WEIGHTED TREE AUGMENTATION problem, F should be of minimum weight. WEIGHTED TREE AUGMENTATION admits several 2-approximation algorithms w.r.t. the standard cut-LP relaxation. Improving this natural ratio is a major open problem, and resolving it may have implications on other network design problems. It seems that achieving this goal requires finding an LP-relaxation with integrality gap better than 2, which is an old open problem even for TREE AUGMENTATION. In this paper we introduce two different LP-relaxations, and for each of them give a simple combinatorial algorithm that computes a feasible solution for TREE AUGMENTATION of size at most 1.75 times the optimal LP value.
Bibliographical noteFunding Information:
The first author’s research was supported in part by NSF grants 1218620 and 1540547 .
© 2018 Elsevier B.V.
- Approximation algorithm
- Laminar family
- Tree augmentation