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Hi Everyone, this is the 171st video of our Playlist "Arrays 1D-2D : Popular Interview Problems" by codestorywithMIK.
Today we will be solving a good problem based out of 2D Array and Prefix Sum : Maximum Side Length of a Square with Sum Less than or Equal to Threshold | 2 Approaches | Leetcode 1292 | codestorywithMIK


Problem Name : Maximum Side Length of a Square with Sum Less than or Equal to Threshold | 2 Approaches | Leetcode 1292 | codestorywithMIK
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Video Summary :
First, build a 2D prefix sum so the sum of any square can be computed in constant time.
Approach 1 : fixes each cell as the top-left corner and keeps expanding the square greedily until the sum crosses the threshold.
Approach 2 : observes that if a square of side k works, smaller squares will also work, so it binary searches on the side length.
Prefix sums are the key that make both approaches efficient by avoiding repeated sum calculations.


✨ Timelines✨
00:00 Introduction
00:25 Motivation
01:05 Problem Explanation
03:21 Constraints Analysis
03:50 Thought Process - Approach - 1
24:08 How to find Prefix sum in 2D Grid ?
36:10 Using Prefix Grid to find Square sum in O(1)
45:01 Coding it up - Approach-1
52:46 Thought Process - Approach - 2
57:58 Coding it up - Approach-2

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