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POBreadth-first search to solve puzzle
 

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    <p>I made a <a href="https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&amp;Itemid=8&amp;page=show_problem&amp;problem=217" rel="nofollow">flip-game</a> and I'm trying to make a method to give the player a hint about their next move. Basically, I'm trying to use a breadth-first search to solve the game and then show the player the next move. I'm having some problems with my algorithm, however. The <code>Exit()</code>s are just to help me debug. Anyway, the algorithm successfully adds the current game state, <code>isWhite</code>, to <code>gameStates</code> and checks if it is a solution. The problem comes when I try to add to the queue. My code never gets to the second <code>Exit()</code> and I can't figure out why. Any help would be appreciated. Thanks.</p> <p>EDIT: Problem fixed. Now I just need to figure out what to do with the solution once I find it...</p> <pre class="lang-cs prettyprint-override"><code> private void hint() { Queue&lt;bool[,]&gt; statesToCheck = new Queue&lt;bool[,]&gt;(); List&lt;bool[,]&gt; closedStates = new List&lt;bool[,]&gt;(); bool[,] rootState = new bool[4, 4]; rootState = (bool[,])isWhite.Clone(); statesToCheck.Enqueue((bool[,])rootState.Clone()); //closedStates.Add((bool[,])rootState.Clone()); while (statesToCheck.Count() &gt; 0) { bool solved = true; //checks for solution state rootState = statesToCheck.Dequeue(); for (int row = 0; row &lt; GAME_SIZE; row++) for (int col = 0; col &lt; GAME_SIZE; col++) { if (!rootState[row, col]) solved = false; } if (solved) { //add something to do System.Diagnostics.Debug.Write("It worked"); return; } else { closedStates.Add((bool[,])rootState.Clone()); } //simulates clicking each space and adds each one to statesToCheck for (int row = 0; row &lt; GAME_SIZE; row++) for (int col = 0; col &lt; GAME_SIZE; col++) { bool[,] stateToChange = new bool[4, 4]; stateToChange = (bool[,])rootState.Clone(); flip(stateToChange, row, col);//gets next gameState (next node in a typical breadth-first search) if (!closedStates.Contains(stateToChange)) { //closedStates.Add((bool[,])rootState.Clone()); statesToCheck.Enqueue((bool[,])stateToChange.Clone()); } } } </code></pre>
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