- Set Matrix Zeroes DaleStudy#283

Author: ayosecu

set-matrix-zeroes/ayosecu.py

@@ -0,0 +1,44 @@
+from typing import List
+
+class Solution:
+    """
+        - Time Complexity: O(mn), m = len(matrix), n = len(matrix[0])
+        - Space Complexity: O(1)
+    """
+    def setZeroes(self, matrix: List[List[int]]) -> None:
+        """
+        Do not return anything, modify matrix in-place instead.
+        """
+        m = len(matrix)
+        n = len(matrix[0])
+
+        # Update row and column with a flag (infinite) if the value is not zero
+        def updateRowCol(i, j):
+            for k in range(m):
+                if matrix[k][j] != 0:
+                    matrix[k][j] = float("inf") 
+            for k in range(n):
+                if matrix[i][k] != 0:
+                    matrix[i][k] = float("inf") 
+
+        # Visit all and update row and column if the value is zero
+        for i in range(m):
+            for j in range(n):
+                if matrix[i][j] == 0:
+                    updateRowCol(i, j)
+        
+        # Update flagged data to zero
+        for i in range(m):
+            for j in range(n):
+                if matrix[i][j] == float("inf"):
+                    matrix[i][j] = 0
+
+tc = [
+        ([[1,1,1],[1,0,1],[1,1,1]], [[1,0,1],[0,0,0],[1,0,1]]),
+        ([[0,1,2,0],[3,4,5,2],[1,3,1,5]], [[0,0,0,0],[0,4,5,0],[0,3,1,0]])
+]
+
+sol = Solution()
+for i, (m, e) in enumerate(tc, 1):
+    sol.setZeroes(m)
+    print(f"TC {i} is Passed!" if m == e else f"TC {i} is Failed! - Expected: {e}, Result: {m}")