title: comparing two int arrays and printing out the difference
body: <blockquote>
    <p>Duplicate question.</p>
  </blockquote>
  
  <p>I'm trying to compare two int arrays that will look for the difference between them. Order is not important, and each array will not have duplicates within itself. For example, I've got:</p>
  
  <pre><code>int[] arr1 = new int[] { 45, 26, 55, 99, 36 };
  int[] arr2 = new int[] { 45, 26, 99, 20, 36 };
  </code></pre>
  
  <p>and I expect { 20, 55 } as a result.</p>