Update set_matrix_zeroes.py

set_matrix_zeroes.py

@@ -20,4 +20,42 @@ def setZeroes(self, matrix: List[List[int]]) -> None:
                 matrix[i][j] = 0
 
         return matrix
+
+
+#2nd Method
+class Solution:
+    def setZeroes(self, matrix: List[List[int]]) -> None:
+        """
+        Do not return anything, modify matrix in-place instead.
+        """
+        m = [0] * len(matrix)
+        n = [0] * len(matrix[0])
+        for i in range(len(matrix)):
+            for j in range(len(matrix[0])):
+                if matrix[i][j] == 0:
+                    m[i] = 1 
+                    n[j] = 1
+        for i in range(len(m)):
+            for j in range(len(n)):
+                if m[i] or n[j]:
+                    matrix[i][j] = 0
+        return matrix
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