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36-valid-sudoku/36-valid-sudoku.py

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+class Solution(object):
+    def isValidSudoku(self, board):
+        """
+        :type board: List[List[str]]
+        :rtype: bool
+        """
+        # Check horizontals
+        for i in range(len(board)):
+            inRow = [False] * 10
+            
+            for j in range(len(board[i])):
+                if board[i][j] == ".":
+                    continue
+                else:
+                    if inRow[int(board[i][j])]:
+                        return False
+                    else:
+                        inRow[int(board[i][j])] = True
+            
+        
+        # Check verticals
+        for j in range(len(board[0])):
+            inColumn = [False] * 10
+            
+            for i in range(len(board)):
+                if board[i][j] == ".":
+                    continue
+                else:
+                    if inColumn[int(board[i][j])]:
+                        return False
+                    else:
+                        inColumn[int(board[i][j])] = True
+        
+        # Check boxes
+        for boxI in range(3):
+            for boxJ in range(3):
+                inBox = [False] * 10
+                for i in range(3):
+                    for j in range(3):
+                        if board[(boxI * 3) + i][(boxJ * 3) + j] == ".":
+                            continue
+                        else:
+                            if inBox[int(board[(boxI * 3) + i][(boxJ * 3) + j])]:
+                                return False
+                            else:
+                                inBox[int(board[(boxI * 3) + i][(boxJ * 3) + j])] = True
+                
+        return True