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Yes, variations of array partitioning problems using prefix sums and hash structures are common in FAANG-style interviews. They test understanding of array manipulation, efficient sum computation, and optimization techniques.
Prefix sums allow you to compute the sum of any subarray in O(1) time after preprocessing. This makes it efficient to compare multiple segment sums while testing different split positions in the array.
A hash set works well alongside prefix sums. It stores possible segment sums from earlier splits so you can quickly check whether a matching sum exists for later segments.
The optimal strategy uses prefix sums combined with a hash set. Prefix sums allow constant-time subarray sum calculations, while a hash set stores candidate sums for quick lookups when checking valid partitions.