Prefix Sum: The Most Underused Interview Technique

How prefix sums solve range queries, subarray problems, and 2D grid problems in O(1) per query — including difference arrays, 2D prefix sums.

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Strong fundamentals in data structures and algorithms are the foundation of technical interviews.

Recognizing coding interview patterns is more effective than memorizing individual solutions.

Keep our data structures cheat sheet handy during practice sessions.

Continue building your skills with Dynamic Programming for Coding Interviews: Patterns, Not....

Continue building your skills with Graph Algorithm DFS, BFS, and Advanced Graph Problems.

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