413. Sum of Consecutive Stack Elements

Given an array of positive integers nums, calculate the sum of all elements that are immediately preceded by a larger element in the array. If an element has no preceding element (it's the first element), or if the preceding element is smaller or equal, it does not contribute to the sum based on this rule. The final result should be the total sum accumulated.

For example, in [5, 2, 8, 3, 9], 2 is preceded by 5 (5 > 2, so add 2), 3 is preceded by 8 (8 > 3, so add 3). The total sum is 2 + 3 = 5.

Input: nums = [5, 2, 8, 3, 9]
Output: 5

Run this challenge interactively in Python or JavaScript when the app loads.