[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

data_structures/arrays/sudoku_solver.py

@@ -2,18 +2,16 @@ class Solution:
     def solveSudoku(self, board: List[List[str]]) -> None:
         n = 9
 
-
         def isValid(row, col, ch):
             row, col = int(row), int(col)
 
             for i in range(9):
-
                 if board[i][col] == ch:
                     return False
                 if board[row][i] == ch:
                     return False
 
-                if board[3*(row//3) + i//3][3*(col//3) + i%3] == ch:
+                if board[3 * (row // 3) + i // 3][3 * (col // 3) + i % 3] == ch:
                     return False
 
             return True
@@ -22,7 +20,7 @@ def solve(row, col):
             if row == n:
                 return True
             if col == n:
-                return solve(row+1, 0)
+                return solve(row + 1, 0)
 
             if board[row][col] == ".":
                 for i in range(1, 10):
@@ -37,8 +35,7 @@ def solve(row, col):
             else:
                 return solve(row, col + 1)
 
-
-
         solve(0, 0)
 
-		#do upvote if it helps.
+
+# do upvote if it helps.