><code data-language="janet">(<span class="mdzsyn-coresym">defn</span> <span class="mdzsyn-symbol">sum3</span>
  <span class="mdzsyn-string">"Solve the 3SUM problem in O(n^2) time."</span>
  [<span class="mdzsyn-symbol">s</span>]
  (<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">tab</span> @{})
  (<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">solutions</span> @{})
  (<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">len</span> (<span class="mdzsyn