LeetCode — Maximum sum of an hourglass (Weekly contest)

You are given an m x n integer matrix grid.

We define an hourglass as a part of the matrix with the following form:

Return the maximum sum of the elements of an hourglass.

Note that an hourglass cannot be rotated and must be entirely contained within the matrix.

Example 1:

Example 2:

Constraints:

  • m == grid.length
  • n == grid[i].length
  • 3 <= m, n <= 150
  • 0 <= grid[i][j] <= 106

Solution:

Time complexity: O(N²)

Space complexity: O(N²)

LeetCode — Maximum sum of an hourglass

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