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Computation of inverse 1-center location problem on the weighted trapezoid graphs. (English) Zbl 1452.05077
Summary: Let $$T_{TRP}$$ be the tree corresponding to the weighted trapezoid graph $$G=(V,E)$$. The eccentricity $$e(v)$$ of the vertex $$v$$ is defined as the sum of the weights of the vertices from $$v$$ to the vertex farthest from $$v \in T_{TRP}$$. A vertex with minimum eccentricity in the tree $$T_{TRP}$$ is called the 1-center of that tree. In an inverse 1-center location problem, the parameter of the tree $$T_{TRP}$$ corresponding to the weighted trapezoid graph $$G=(V,E)$$, like vertex weights, have to be modified at minimum total cost such that a pre-specified vertex $$s\in V$$ becomes the 1-center of the trapezoid graph $$G$$. In this paper, we present an optimal algorithm to find an inverse 1-center location on the weighted tree $$T_{TRP}$$ corresponding to the weighted trapezoid graph $$G=(V,E)$$, where the vertex weights can be changed within certain bounds. The time complexity of our proposed algorithm is $$O(n)$$, where $$n$$ is the number of vertices of the trapezoid graph $$G$$.
##### MSC:
 05C22 Signed and weighted graphs 05C85 Graph algorithms (graph-theoretic aspects) 05C05 Trees 68Q17 Computational difficulty of problems (lower bounds, completeness, difficulty of approximation, etc.)
##### Software:
MENU-OKF; MOD-DIST; SITATION
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