# Find the sum of Z shape in the given matrix

**Approach1:**

*Simple algorithm*

- n := row count of matrix
- if n <= 2, then
- return sum of all elements in matrix
- first_row := sum of first row
- last_row := sum of last row
- diagonal = sum of matrix[i, n-1-i] for all i from 1 to n-2
- return first_row + last_row + diagonal

`class SumZshape:`

def solve(self, matrix):

n = len(matrix)

if n <= 2…