If you enjoyed this article, please consider following me on twitter. ("Completed in " + (System.currentTimeMillis() - time) + " ms.") start recursively search for the initial board from the goal (reverse direction!) fill in the global moves variable that is used by the solver randomize the order of the moves (this highly influences the resulting runtime) Private static void printBoard(long board) Private static final long moves = new long Private static final long VALID_BOARD_CELLS = 124141734710812L The next click will start a new gae with the clicked-on location as the open spot. Private static final long INITIAL_BOARD = 124141717933596L First Click: A clicked on peg has only one possible jmp, so take thatjp Second Click: A clicked on peg has two possible jumps, so two mouse clicks are required to execute the jmmp Gane Over: There are no more legal jumps (the game is over). Private static final long GOAL_BOARD = 16777216L Private static final ArrayList solution = new ArrayList() Private static final HashSet seenBoards = new HashSet() The following is 52 lines of code according to IntelliJ LoC metric. Update: In the following you’ll find the Java version, but the reddit user leonardo_m has also translated the code to C++! which move makes “more sense” for a given board. The branch that the algorithm follows might not include a solution, but it still is searched in its entirety.Īn idea to reduce the fluctuation would be to use heuristics and to rank the moves depending on the board, i.e. The program always checks the moves in the same order when looking at any given boards and sometimes this (initially determined) order is “unlucky”. Interestingly the run time highly fluctuates, depending on the ordering of the possible moves. In general a gigabyte of ram, used to remember the known boards, should be enough to allow for a solution to be found. Not doing so means that my computer is still working on a solution since 24 hours (however it is using almost no ram). Remembering the boards that we have already seen (and not rechecking them unnecessarily) means that a solution is found in a very reasonable time (usually a few seconds). Use an abstract base class to factor out the common code between these two model. With this particular algorithm it is no different. As its name suggests, the board for Triangular Peg Solitaire has pegs. There is often a tradeoff with algorithms when it comes to memory usage and run time. You can find more details on this in the comment header of the program below. The really interesting part is that the algorithm is optimized by reverting the search direction. Checking of possible moves and applying them can be done by using simple bit operations. However there are some bits that are not valid and never used, i.e. The first 49 bits (7 x 7) of the long represent the board. The idea is as following: Since there exists 33 slots on the board, it can not be represented by using an integer (32 bits), but we can use a long (64 bits). The implementation is highly optimized and uses bit operators to efficiently find a solution. English Peg Solitaire Solution Implementation
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