259. Diagonal Traverse

MediumMatrix

Given an m x n matrix mat, return an array of all the elements of the array in a diagonal order.

Examples

Input: [[1,2,3],[4,5,6],[7,8,9]]

Output: [1,2,4,7,5,3,6,8,9]

Explanation: Zig-zag diagonal order.

Constraints

  • m == mat.length
  • n == mat[i].length
  • 1 <= m, n <= 10^4
  • 1 <= m * n <= 10^4
  • -10^5 <= mat[i][j] <= 10^5
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