Spider-Man Met Kangaroos

On his way back to home, Spider-Man saw $N$ kangaroos standing in a queue. The age of the kangaroo standing at $i^{th}$ position is $A_i$ (in days), & it can jump with a length of $L_i$. Spider-Man wants your help to find the **minimum** number of jumps required by kangaroos so that they can stand in **decreasing** order $w.r.t.$ their age. Kangaroos can jump only in one direction, $i.e.$, **from