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Word problem for linear bounded automata [25]; Word problem for quasi-realtime automata [26]; Emptiness problem for a nondeterministic two-way finite state automaton [27] [28] ...
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The largest puzzle (40,320 pieces) is made by a German game company Ravensburger. [8] The smallest puzzle ever made was created at LaserZentrum Hannover. It is only five square millimeters, the size of a sand grain. The puzzles that were first documented are riddles. In Europe, Greek mythology produced riddles like the riddle of the Sphinx ...
This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.
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The computational problem of solving Sokoban puzzles was first shown to be NP-hard. [9] [10] Further work proved it is also PSPACE-complete. [11] [12] Solving non-trivial Sokoban puzzles is difficult for computers because of the high branching factor (many legal pushes at each turn) and the large search depth (many pushes needed to reach a ...
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