rval. To do this efficiently, we record the right endpoint of every interval. Then, for each queried node, w...

umber of non-empty subarrays starting at the left endpoint of this interval whose product of elements has re...

a two-pointer algorithm, we can compute the left endpoint of the adjacent interval for every node. To facil...

)$ is the student's starting position. The target endpoint is any valid state where the mask equals $\textit...

select $k$ different subarrays. For a fixed left endpoint $l$, as the right endpoint $r$ increases, the max...

is balanced. Specifically: We enumerate the left endpoint $i$ of the substring and then enumerate the right...

meration Intuition We enumerate all possible left endpoints $i$ of subarrays and then extend the right endpo...

most recent index. This is because when the right endpoint is fixed later, a closer left endpoint results in...