title: what exactly is the brute force algorithm
body: <ol>
  <li><p>what exactly is the brute force algorithm? (besides just the approach only)</p></li>
  <li><p>when a problem can use brute-force approach, and when not to?</p></li>
  <li><p>What characteristics are there in an algorithm, when the algorithm uses brute force approach?</p></li>
  </ol>