title: Sparse Matrices
body: <p>How can we display a sparse matrix? Someone who wanted to help me said: use linked lists.<br>
  Also I have read some where that we should create class like this :</p>
  
  <pre><code>SpMatrix
  {
      int non_zero_value;
      int i,j;
  }
  </code></pre>
  
  <p>Exactly what is a sparse matrix, I have read wekipedia and other sites. but the problem isn't solved yet.</p>
  
  <p>thanks in advance.</p>