Method CrossSum

python/1572-matrix-diagonal-sum.py:9–13

(self,mat)

        return cnt

    def CrossSum(self,mat):
        cnt = 0
        for i in range(len(mat)):
            cnt += mat[i][len(mat) - i - 1]
        return cnt

    def diagonalSum(self, mat: List[List[int]]) -> int:
        prime = self.PrimeSum(mat)