<p>Given two binary search trees <code>root1</code> and <code>root2</code>, return <em>a list containing all the integers from both trees sorted in <strong>ascending</strong> order</em>.</p> <p> </p> <p><strong>Example 1:</strong></p> <img alt="" src="https://assets.leetcode.com/uploads/2019/12/18/q2-e1.png" style="width: 457px; height: 207px;" /> <pre> <strong>Input:</strong> root1 = [2,1,4], root2 = [1,0,3] <strong>Output:</strong> [0,1,1,2,3,4] </pre> <p><strong>Example 2:</strong></p> <img alt="" src="https://assets.leetcode.com/uploads/2019/12/18/q2-e5-.png" style="width: 352px; height: 197px;" /> <pre> <strong>Input:</strong> root1 = [1,null,8], root2 = [8,1] <strong>Output:</strong> [1,1,8,8] </pre> <p> </p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in each tree is in the range <code>[0, 5000]</code>.</li> <li><code>-10<sup>5</sup> <= Node.val <= 10<sup>5</sup></code></li> </ul>