Combinatorial optimization | Analysis of algorithms | Search algorithms | Computational complexity theory

Combinatorial search

In computer science and artificial intelligence, combinatorial search studies search algorithms for solving instances of problems that are believed to be hard in general, by efficiently exploring the usually large solution space of these instances. Combinatorial search algorithms achieve this efficiency by reducing the effective size of the search space or employing heuristics. Some algorithms are guaranteed to find the optimal solution, while others may only return the best solution found in the part of the state space that was explored. Classic combinatorial search problems include solving the eight queens puzzle or evaluating moves in games with a large game tree, such as reversi or chess. A study of computational complexity theory helps to motivate combinatorial search. Combinatorial search algorithms are typically concerned with problems that are NP-hard. Such problems are not believed to be efficiently solvable in general. However, the various approximations of complexity theory suggest that some instances (e.g. "small" instances) of these problems could be efficiently solved. This is indeed the case, and such instances often have important practical ramifications. (Wikipedia).

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Related pages

Combinatorial optimization | Chess | State space search | Reversi | Artificial intelligence | Computational complexity theory | Search algorithm | Game tree | Brute-force search | Exponential growth | A* search algorithm | Minimax | Combinatorial explosion | Eight queens puzzle | Breadth-first search