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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-266/
+"""
+
+Task 2: X Matrix
+
+Submitted by: [42]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given a square matrix, $matrix.
+
+   Write a script to find if the given matrix is X Matrix.
+
+     A square matrix is an X Matrix if all the elements on the main
+     diagonal and antidiagonal are non-zero and everything else are zero.
+
+Example 1
+
+Input: $matrix = [ [1, 0, 0, 2],
+                   [0, 3, 4, 0],
+                   [0, 5, 6, 0],
+                   [7, 0, 0, 1],
+                 ]
+Output: true
+
+Example 2
+
+Input: $matrix = [ [1, 2, 3],
+                   [4, 5, 6],
+                   [7, 8, 9],
+                 ]
+Output: false
+
+Example 3
+
+Input: $matrix = [ [1, 0, 2],
+                   [0, 3, 0],
+                   [4, 0, 5],
+                 ]
+Output: true
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 28th April
+   2024.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+"""
+### solution by pokgopun@gmail.com
+
+def hasAllZero(arr):
+    return 
+
+def mtxIsValid(mtx: list):
+    l = len(mtx)
+    if l < 3:
+        return None
+    h = l // 2
+    col = 0
+    lst = list()
+    for row in range(h):
+        for r in (row,-row-1):
+            lst = [e for e in mtx[r]]
+            if len(lst) != l:
+                return None
+            for c in (col,-col-1):
+                if lst[c] == 0:
+                    return False
+                lst[c] = 0
+            for e in lst:
+                if e != 0:
+                    return False
+        col += 1
+    if h % 2:
+        lst = [e for e in mtx[h]]
+        if len(lst) != l:
+            return None
+        if mtx[h][h] == 0:
+            return False
+        lst[h] = 0
+        for e in lst:
+            if e != 0:
+                return False
+    return True
+
+import unittest
+
+class TestMtxIsValid(unittest.TestCase):
+    def test(self):
+        for ans, mtx in {
+                True: [ [1, 0, 0, 2],
+                    [0, 3, 4, 0],
+                    [0, 5, 6, 0],
+                    [7, 0, 0, 1],],
+                False: [ [1, 2, 3],
+                    [4, 5, 6],
+                    [7, 8, 9],],
+                True: [ [1, 0, 2],
+                    [0, 3, 0],
+                    [4, 0, 5],],
+                }.items():
+            self.assertEqual(ans,mtxIsValid(mtx))
+
+unittest.main()