no. 4
Packing of (0, 1)-matrices
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 40 (2006) no. 4, pp. 519-535.

The MATRIX PACKING DOWN problem asks to find a row permutation of a given (0,1)-matrix in such a way that the total sum of the first non-zero column indexes is maximized. We study the computational complexity of this problem. We prove that the MATRIX PACKING DOWN problem is NP-complete even when restricted to zero trace symmetric (0,1)-matrices or to (0,1)-matrices with at most two 1’s per column. Also, as intermediate results, we introduce several new simple graph layout problems which are proved to be NP-complete.

DOI : 10.1051/ita:2006037
Classification : 68Q17, 68Q25
Mots clés : NP-hardness, $(0,1)$-matrix 
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Vialette, Stéphane. Packing of (0, 1)-matrices. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 40 (2006) no. 4, pp. 519-535. doi : 10.1051/ita:2006037. http://www.numdam.org/articles/10.1051/ita:2006037/

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