Web Reference: Jul 23, 2025 · The Prefix Sum Technique is a powerful and widely used approach in coding interviews, especially for optimizing queries related to subarray sums and cumulative computations. Prefix sum is one of the most elegant patterns in algorithmic problem solving. It transforms O (n) range queries into O (1) lookups. It enables O (n) solutions to subarray problems that would otherwise be O (n²). And once you master it, you'll recognize it instantly in dozens of LeetCode problems. Mar 13, 2025 · Range Sum Query - Immutable. Given an integer array nums, and multiple queries, each query is a pair of indices [i,j], return corresponding sums of these queries.
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