Diagonal Traverse
Medium
Given an m x n matrix mat , produce an array of all the elements of the array in a diagonal order .
Example 1
Input: mat = [[1,2,3],[4,5,6],[7,8,9]]
Output: [1,2,4,7,5,3,6,8,9]
Example 2
Input: mat = [[1,2],[3,4]]
Output: [1,2,3,4]
Constraints
m == mat.lengthn == mat[i].length1 <= m, n <= 10^41 <= m * n <= 10^4-10^5<= mat[i][j] <= 10^5
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