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Quick Summary
Iterate through all valid square submatrices of a specified size within a 2D array.
Calculate the sum of only the outer border elements for each submatrix.
Identify the maximum border sum, collect all unique values from frames that achieve it, and return their total.
What This Tests
2D Array traversal and coordinate indexing
Boundary extraction without double-counting corners
Dynamic state tracking for maximum values
Set operations for uniqueness filtering
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Input
matrix =
frameSize =
Output
Expected
