Given an n x n array of integers matrix, return the minimum sum of any falling path through matrix. A falling path starts at any element in the first row and chooses the element in the next row that is either directly below or diagonally left/right. Specifically, the next element from position (row, col) will be (row + 1, col - 1), (row + 1, col), or (row + 1, col + 1). Example 1: Input: matrix = [[2,1,3],[6,5,4],[7,8,9]] Output: 13 Explanation: There are two falling paths with a minimum sum underlined below: [[2,1,3], [[2,1,3], [6,5,4], [6,5,4], [7,8,9]] [7,8,9]] Example 2: Input: matrix = [[-19,57],[-40,-5]] Output: -59 Explanation: The falling path with a minimum sum is underlined below: [[-19,57], [-40,-5]] Example 3: Input: matrix = [[-48]] Output: -48 Constraints: n == matrix.length n == matrix[i].length 1 <= n <= 100 -100 <= matrix[i][j] <= 100