Leetcode 303 Range Sum Query - Immutable (Java)

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Leetcode 303 Range Sum Query - Immutable

We use the Prefix Sum Approach to optimize multiple calls

0:00 Problem Introduction
1:30 Brute Force Solution
1:50 Optimized Solution
5:53 Coding
8:30 Discuss Small Optimization
10:11 Running/Debugging Solution

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Algorithm is to create a hashMap which stores index and sum, so that next time we can query only highest index - lowest index to get the result.

dineshr

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