The Complexity of Flood Filling Games
The Complexity of Flood Filling Games
复制标题
洪水填充游戏的复杂性
DOI:
10.1007/s00224-011-9339-2
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发表时间:
2011
影响因子:
0.5
通讯作者:
Clifford R
中科院分区:
文献类型:
--
作者:
Clifford R
We study the complexity of the popular one player combinatorial game known as Flood-It. In this game the player is given ann×nboard of tiles where each tile is allocated one ofccolours. The goal is to make the colours of all tiles equal via the shortest possible sequence of flooding operations. In the standard version, a flooding operation consists of the player choosing a colourk, which then changes the colour of all the tiles in the monochromatic region connected to the top left tile tok. After this operation has been performed, neighbouring regions which are already of the chosen colourkwill then also become connected, thereby extending the monochromatic region of the board. We show that finding the minimum number of flooding operations isNP-hard forc≥3 and that this even holds when the player can perform flooding operations from any position on the board. However, we show that this ‘free’ variant is inPforc=2. We also prove that for an unbounded number of colours, Flood-It remainsNP-hard for boards of height at least 3, but is inPfor boards of height 2. Next we show how a (c−1) approximation and a randomised 2c/3 approximation algorithm can be derived, and that no polynomial time constant factor, independent ofc, approximation algorithm exists unlessP=NP. We then investigate how many moves are required for the ‘most demanding’n×nboards (those requiring the most moves) and show that the number grows as fast as. Finally, we consider boards where the colours of the tiles are chosen at random and show that forc≥2, the number of moves required to flood the whole board is Ω(n) with high probability.
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DOI:
10.1006/jctb.2001.2045
发表时间:
1999-11
期刊:
J. Comb. Theory B
影响因子:
--
作者:
Eli Berger
通讯作者:
Eli Berger
影响因子:
1.1
作者:
D. Peleg
通讯作者:
D. Peleg
DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
L. Fontes;C. Newman
通讯作者:
C. Newman
影响因子:
1
作者:
L. Chayes;C. Winfield
通讯作者:
C. Winfield
DOI:
--
发表时间:
2001
期刊:
arXiv.org
影响因子:
--
作者:
T. Biedl;E. Demaine;M. Demaine;R. Fleischer;Lars Jacobsen;J. Munro
通讯作者:
J. Munro