Grokking the Coding Interview: Patterns for Coding Questions
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Introduction Prefix Sum Pattern
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What is Prefix Sum?

A prefix sum is the cumulative sum of elements in an array up to a certain index. It is a powerful tool for efficiently solving range sum queries and various subarray problems. By precomputing the prefix sums of an array, we can quickly calculate the sum of any subarray in constant time. This technique is widely used in algorithmic problems to improve performance and reduce time complexity, making it essential for handling large datasets and multiple queries efficiently.

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