laskeSummalista

laskeSummalista is a fictional data-structure concept used in theoretical discussions and teaching materials to illustrate how cumulative sums can be organized in a list. The term appears as a portmanteau, combining language roots that evoke counting and summation. In most depictions, laskeSummalista serves as a model rather than a concrete implementation.

Core to the concept is a sequence of entries where each item carries a numeric value and a running total up to that point. Typical operations include inserting a new value, removing or updating an existing one, and querying either a prefix sum up to a position or the total sum of the list. The model emphasizes immutability in some demonstrations and mutability in others.

Implementation notes in educational materials often present two archetypes. A simple dynamic array approach stores each value alongside its cumulative total, providing O(1) access for the latest sum but O(n) updates when insertions occur in the middle. A more efficient variant uses a Fenwick tree (Binary Indexed Tree) or a segment tree to maintain prefix sums with O(log n) updates and queries.

Usage scenarios cited in introductory materials include teaching prefix sums and cumulative queries, modeling financial ledgers, and illustrating data-structure tradeoffs in computer science curricula. While laskeSummalista remains a hypothetical construct, it provides a compact vocabulary for discussing running totals and their maintenance in dynamic lists. See also prefix sum, cumulative sum, Fenwick tree, segment tree.