Program to check if matrix is lower triangular

Given a square matrix and the task is to check the matrix is in lower triangular form or not. A square matrix is called lower triangular if all the entries above the main diagonal are zero. 

👁 Image

Examples: 

Input : mat[4][4] = {{1, 0, 0, 0},
 {1, 4, 0, 0},
 {4, 6, 2, 0},
 {0, 4, 7, 6}};
Output : Matrix is in lower triangular form.

Input : mat[4][4] = {{1, 0, 0, 0},
 {4, 3, 0, 1},
 {7, 9, 2, 0},
 {8, 5, 3, 6}};
Output : Matrix is not in lower triangular form.

Implementation:

Yes

Time Complexity: O(n²), where n represents the number of rows and columns of the matrix.
Auxiliary Space: O(1), no extra space is required, so it is a constant.