Скачать или смотреть LeetCode 303 | Range Sum Query - Immutable | Brute Force Approach in Java | CodeZen by Sharad

In this video, we are implementing the Sum of Range Query using a Brute Force approach in Java. This method calculates the sum of elements between two given indices (left and right) by iterating through the array.

🔹 Brute Force Approach Explanation:
We maintain an array nums[] to store the given elements.

The sumRange(int left, int right) function iterates from left to right index and calculates the sum of elements within that range.

This approach works in O(N) time complexity for each query since we traverse the subarray every time we call sumRange().
🔹 Time Complexity:
O(N) per query since we loop from left to right every time we call sumRange().

🔹 Drawbacks of Brute Force Approach:
🚨 Slow for multiple queries – If we have multiple sumRange() calls, this approach becomes inefficient.
🚨 Not optimal for large arrays – For an array with N elements and Q queries, the total complexity can go up to O(N * Q).

🔹 Optimized Approach (Prefix Sum)
To improve efficiency, we can use Prefix Sum to preprocess the sums, reducing query time to O(1). Let me know if you want a video on that!

💻 Watch till the end for detailed explanation with Dry Run!
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