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IEICE Trans

Akihiro UEJIMA

Light Up Variants are NP-Complete
Akihiro UEJIMA Shota MASUDA Takaaki YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2026/03/01
Vol. E109-D  No. 3  pp. 365-373
Type of Manuscript:  Special Section PAPER (Special Section on Foundations of Computer Science —Foundations and New Trends of Computation Theory—)
Category: 
Keyword: 
light up, Akari, pencil puzzle, n-Queens, NP-complete, 
 Summary | Full Text:PDF
-Coloring Problem
Akihiro UEJIMA Hiro ITO Tatsuie TSUKIJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/05/01
Vol. E87-A  No. 5  pp. 1243-1250
Type of Manuscript:  PAPER
Category: Graphs and Networks
Keyword: 
H-coloring, cycles of odd order, complement graphs, NP-completeness, 
 Summary | Full Text:PDF
On H-Coloring Problems with H Expressed by Complements of Cycles, Bipartite Graphs, and Chordal Graphs
Akihiro UEJIMA Hiro ITO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/05/01
Vol. E85-A  No. 5  pp. 1026-1030
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
H-coloring, bipartite graphs, chordal graph, complement graphs, perfect graphs, 
 Summary | Full Text:PDF