Solved for all test cases

NeetCodeRoadmap/Arrays_and_Hashing/36_Valid_Sudoku.py

@@ -3,14 +3,22 @@ def isValidSudoku(board):
     :type board: List[List[str]]
     :rtype: bool
     """
-    temp = []
-    for x in range(len(board)):
-        for y in range(len(board[x])):
-            if y not in temp:
-                temp.append(board[x])
-            else:
+    rows = [set() for x in range(9)]
+    columns = [set() for x in range(9)]
+    squares = [[set() for x in range(3)] for y in range(3)]
+    
+    for x in range(9):
+        for y in range(9):
+            cell_value = board[x][y]
+            if cell_value == ".":
+                continue
+            if cell_value in rows[x] or cell_value in columns[y] or cell_value in squares[x//3][y//3]:
                 return False
-        temp = temp /3*3
+
+            rows[x].add(cell_value)
+            columns[y].add(cell_value)
+            squares[x//3][y//3].add(cell_value)
+    
     return True