840. Magic Squares In Grid LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Magic Squares In Grid 3 x 3 magic square is a 3 x 3 grid filled with distinct numbers from 1 to 9 such that each row, column, and both diagonals all have the same sum.

Given a row x col grid of integers, how many 3 x 3 “magic square” subgrids are there?  (Each subgrid is contiguous).

Example 1:

Input: grid = [[4,3,8,4],[9,5,1,9],[2,7,6,2]]
Output: 1
The following subgrid is a 3 x 3 magic square:

while this one is not:

In total, there is only one magic square inside the given grid.

Example 2:

Input: grid = [[8]]
Output: 0


  • row == grid.length
  • col == grid[i].length
  • 1 <= row, col <= 10
  • 0 <= grid[i][j] <= 15

Magic Squares In Grid Solutions

Time: O(n)
Space: O(n)


 Will be updated Soon


 Will be updated Soon


  Will be updated Soon

Watch Tutorial

Checkout more Solutions here

Leave a Comment

Your email address will not be published. Required fields are marked *