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POProblem with Queue
 

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  1. POProblem with Queue
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    <p>I'm trying to make a program using the BFS algorithm so I put every node in a Queue and once every level is in the Queue I start comparing it to another node to see if they are equal or not, however the problem I'm having is that elements in my Queue are being modified so when I do the Dequeue I never get to an answer and I'm getting a stack overflow.</p> <p>I'm not sure what part of my code had the problem since I the stack overflow happens all over the place, but I'll post a part of the Queuing and the Dequeuing.</p> <p>So yeah basically after the second loop it starts messing up everything, it adds more than 1 "b" to my matrix and it modifies my Queue elements.</p> <pre><code>private void BFS(Nodo&lt;string[,]&gt; nodo) { Array.Copy(nodo.getEA(), datos5, 9); temp = null; temp2 = null; temp3 = null; temp4 = null; Array.Copy(datos5, datos, 9); //There are a bunch of if and else if so I just posted one if (datos[1, 0].Equals("b")) { Array.Copy(datos, datos2, 9); Array.Copy(datos, datos3, 9); cont3=3; //UP from 1,0 a 0,0 datos[1, 0] = datos[0, 0]; datos[0, 0] = "b"; temp = new Nodo&lt;string[,]&gt;(datos); temp.setCamino("U"); temp.setPadre(nodo); myq.Enqueue(temp); temp = null; //Right from 1,0 a 1,1 datos2[1, 0] = datos2[1, 1]; datos2[1, 1] = "b"; temp2 = new Nodo&lt;string[,]&gt;(datos2); temp2.setCamino("R"); temp2.setPadre(nodo); myq.Enqueue(temp2); temp = null; //Down from 1,0 a 2,0 datos3[1, 0] = datos3[2, 0]; datos3[2, 0] = "b"; temp3 = new Nodo&lt;string[,]&gt;(datos3); temp3.setCamino("D"); temp3.setPadre(nodo); myq.Enqueue(temp3); fila(); } </code></pre> <p>}</p> <pre><code>private void fila() { Nodo&lt;string[,]&gt; temp5; for (int i = 0; i &lt; myq.Count; i++) { temp5 = null; temp5 = (Nodo&lt;string[,]&gt;)myq.Dequeue(); if (objetivo(temp5, nodof)) { if (!flag2) { boxResultado.AppendText("Problem solved"); flag2 = true; break; } else { break; } } else { if (!flag2) { BFS(temp5); } else { break; } } } } private bool objetivo(Nodo&lt;string[,]&gt; p, Nodo&lt;string[,]&gt; e) { nodo1 = null; nodo2 = null; bool flag = false; nodo1 = p.getEA(); nodo2 = e.getEA(); for (int i = 0; i &lt; 3; i++) { for (int f = 0; f &lt; 3; f++) { if (nodo1[i, f] != nodo2[i, f]) { flag = true; } } } if (flag) { return false; } else { return true; } } </code></pre> <p>I know my code is pretty horrible but I've been trying to figure out that problem for the past 5 hours or so so I've been modifying here and there trying to locate the problem, but I'm getting pretty frustrated so I decided to ask here for help. Btw this is in C#</p> <p>Thanks in advance</p>
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    1. USJadager
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