Knock Down the Smaller Towers

Each new tower rolls in from the right and flattens every SHORTER tower in its path, stopping at the first one as tall or taller. 🏗️

You get the tower heights in arrival order. Simulate the destruction and print the surviving towers left to right, comma-separated.

Example:

Input: heights = [3, 1, 4, 2, 5] Output: 5

1 isn't flattened by anything yet, but 4 rolls in and flattens both 3 and 1; 2 survives behind 4; then 5 rolls in and flattens 4 and 2 — only 5 survives.