Name
Abstract | ||
|---|---|---|
Dirac's theorem (1952) is a classical result of graph theory, stating that an n-vertex graph (n >= 3) is Hamiltonian if every vertex has degree at least n/2. Both the value n/2 and the requirement for every vertex to have high degree are necessary for the theorem to hold.In this work we give efficient algorithms for determining Hamiltonicity when either of the two conditions are relaxed. More precisely, we show that the HAMILTONIAN CYCLE problem can be solved in time c(k) center dot n(O(1)), for a fixed constant c, if at least n - k vertices have degree at least n/2, or if all vertices have degree at least n/2 - k. The running time is, in both cases, asymptotically optimal, under the exponential-time hypothesis (ETH).The results extend the range of tractability of the HAMILTONIAN CYCLE problem, showing that it is fixed-parameter tractable when parameterized below a natural bound. In addition, for the first parameterization we show that a kernel with O(k) vertices can be found in polynomial time. |
Year | DOI | Venue |
|---|---|---|
2019 | 10.1007/978-3-030-30786-8_3 | GRAPH-THEORETIC CONCEPTS IN COMPUTER SCIENCE (WG 2019) |
Keywords | Field | DocType |
Hamiltonicity, Fixed-parameter tractability, Kernelization | Graph theory,Discrete mathematics,Combinatorics,Parameterized complexity,Vertex (geometry),Hamiltonian (quantum mechanics),Dirac (video compression format),Hamiltonian path problem,Time complexity,Asymptotically optimal algorithm,Mathematics | Journal |
Volume | ISSN | Citations |
11789 | 0302-9743 | 0 |
PageRank | References | Authors |
0.34 | 0 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Bart M. P. Jansen | 1 | 232 | 20.86 |
| László Kozma | 2 | 0 | 0.34 |
| Jesper Nederlof | 3 | 294 | 24.22 |