3212. Count Submatrices With Equal Frequency of X and Y | Weekly Leetcode 405
Segment Tree Series - https://bit.ly/segment-trees
Another Interesting 2D Prefix Sum Application - • 2D Prefix Sums | Weekly Contest 328 | Incr...
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Contest Link - https://leetcode.com/contest/weekly-c...
Problem Link - https://leetcode.com/contest/weekly-c...
Solution - https://leetcode.com/problems/count-s...
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Timestamps -
00:00 - Agenda
00:39 - Problem Description
01:53 - Brute force solution
06:30 - Intuition to optimize
07:33 - 2D Prefix Sum
12:06 - Dry run of 2D Prefix Sum
15:25 - Final Solution & Time Complexity
16:50 - Code Walkthrough
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