Leetcode Problem 840. Magic Squares In Grid

840. Magic Squares In Grid

Leetcode Solutions

Initialize a counter to keep track of the number of magic squares found.
Iterate over the grid with indices r and c such that a 3x3 subgrid can be formed starting at grid[r][c].
For each subgrid, check if the center element is 5; if not, skip to the next subgrid.
Check if all elements in the subgrid are unique and between 1 and 9.
Calculate the sums of all rows, columns, and diagonals in the subgrid.
If all sums are equal to 15, increment the counter.
Return the counter after checking all possible subgrids.

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