title: Finding node of intersection of two linked list
body: <p><strong>How to find a node of intersection of a linked list?</strong></p>
  
  <pre><code>     A1--&gt;A2--&gt;A3--&gt;A4--&gt;A5--&gt;A6--&gt;A7
                           ^
                           |
                 B1--&gt;B2--&gt;B3
  </code></pre>
  
  <ol>
  <li>A and B are two linked linked lists</li>
  <li>A1, A2...A7 and B1.. B3 are nodes of a the list</li>
  <li>list A and B intersect at A5.</li>
  </ol>
  
  <p>We have to find the node of intersection</p>