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On Erd˝os-Gallai and Havel-Hakimi algorithms

On Erd˝os-Gallai and Havel-Hakimi algorithms

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32 A. Iványi, L. Lucz, T. F. Móri, P. Sótér<br />

n running time (in days) number of slices<br />

24 7 415<br />

25 26 415<br />

26 70 435<br />

27 316 435<br />

28 1130 2001<br />

29 6733 15119<br />

Figure 10: The runnng time of EGEP for n = 24, . . . , 29.<br />

n = 23 are the elements of sequence A0004251-es [76] of OEIS. The remaining<br />

values are new [37, 38].<br />

Figure 2 contains the number of graphical sequences G(n) for n = 1, . . . , 29,<br />

<strong>and</strong> also G(n + 1)/G(n) for n = 1, . . . , 29.<br />

The referenced manuscripts, programs <strong>and</strong> further simulation results can be<br />

found at the homepage of the authors, among others at<br />

http://compalg.inf.elte.hu/∼tony/Kutatas/EGHH/.<br />

Acknowledgements. The authors thank Zoltán Király (Eötvös Loránd University,<br />

Faculty of Science, Dept. of Operation Research) for his advice concerning<br />

the weight points, Antal Sándor <strong>and</strong> his colleagues (Eötvös Loránd<br />

University, Faculty of Informatics), further Ádám Mányoki (TFM World Kereskedelmi<br />

és Szolgáltató Kft.) for their help in running of our timeconsuming<br />

programs <strong>and</strong> the unknown referee for the useful corrections. The European<br />

Union <strong>and</strong> the European Social Fund have provided financial support to<br />

the project under the grant agreement no. TÁMOP 4.2.1/B-09/1/KMR-2010-<br />

0003.<br />

References<br />

[1] M. Anholcer, V. Babiy, S. Bozóki, W. W. Koczkodaj, A simplified implementation<br />

of the least squares solution for pairwise comparisons matrices.<br />

CEJOR Cent. Eur. J. Oper. Res. 19, (4) (2011) 439–444. ⇒2<br />

[2] S. R. Arikati, A. Maheshwari, Realizing degree sequences in parallel.<br />

SIAM J. Discrete Math. 9, (2) (1996) 317–338. ⇒2

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