<p>Given an array of positive integers <code>nums</code>, return the <em>maximum possible sum of an <strong>ascending</strong> subarray in </em><code>nums</code>.</p>
<p>A subarray is defined as a contiguous sequence of numbers in an array.</p>
<p>A subarray <code>[nums<sub>l</sub>, nums<sub>l+1</sub>, ..., nums<sub>r-1</sub>, nums<sub>r</sub>]</code> is <strong>ascending</strong> if for all <code>i</code> where <code>l <= i < r</code>, <code>nums<sub>i </sub>< nums<sub>i+1</sub></code>. Note that a subarray of size <code>1</code> is <strong>ascending</strong>.</p>