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Link for the Problem – Valid Sudoku– LeetCode Problem
Valid Sudoku– LeetCode Problem
Problem:
Determine if a 9 x 9
Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
- Each row must contain the digits
1-9
without repetition. - Each column must contain the digits
1-9
without repetition. - Each of the nine
3 x 3
sub-boxes of the grid must contain the digits1-9
without repetition.
Note:
- A Sudoku board (partially filled) could be valid but is not necessarily solvable.
- Only the filled cells need to be validated according to the mentioned rules.
Example 1:
![Valid Sudoku LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct] 2 250px Sudoku by L2G 20050714.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Sudoku-by-L2G-20050714.svg/250px-Sudoku-by-L2G-20050714.svg.png)
Input: board = [["5","3",".",".","7",".",".",".","."] ,["6",".",".","1","9","5",".",".","."] ,[".","9","8",".",".",".",".","6","."] ,["8",".",".",".","6",".",".",".","3"] ,["4",".",".","8",".","3",".",".","1"] ,["7",".",".",".","2",".",".",".","6"] ,[".","6",".",".",".",".","2","8","."] ,[".",".",".","4","1","9",".",".","5"] ,[".",".",".",".","8",".",".","7","9"]] Output: true
Example 2:
Input: board = [["8","3",".",".","7",".",".",".","."] ,["6",".",".","1","9","5",".",".","."] ,[".","9","8",".",".",".",".","6","."] ,["8",".",".",".","6",".",".",".","3"] ,["4",".",".","8",".","3",".",".","1"] ,["7",".",".",".","2",".",".",".","6"] ,[".","6",".",".",".",".","2","8","."] ,[".",".",".","4","1","9",".",".","5"] ,[".",".",".",".","8",".",".","7","9"]] Output: false Explanation: Same as Example 1, except with the 5 in the top left corner being modified to 8. Since there are two 8's in the top left 3x3 sub-box, it is invalid.
Constraints:
board.length == 9
board[i].length == 9
board[i][j]
is a digit1-9
or'.'
.
Valid Sudoku– LeetCode Solutions
class Solution { public: bool isValidSudoku(vector<vector<char>>& board) { unordered_set<string> seen; for (int i = 0; i < 9; ++i) for (int j = 0; j < 9; ++j) { if (board[i][j] == '.') continue; const string c(1, board[i][j]); if (!seen.insert(c + "@row" + to_string(i)).second || !seen.insert(c + "@col" + to_string(j)).second || !seen.insert(c + "@box" + to_string(i / 3) + to_string(j / 3)) .second) return false; } return true; } };
class Solution { public boolean isValidSudoku(char[][] board) { Set<String> seen = new HashSet<>(); for (int i = 0; i < 9; ++i) for (int j = 0; j < 9; ++j) { if (board[i][j] == '.') continue; final char c = board[i][j]; if (!seen.add(c + "@row" + i) || !seen.add(c + "@col" + j) || !seen.add(c + "@box" + i / 3 + j / 3)) return false; } return true; } }
class Solution: def isValidSudoku(self, board: List[List[str]]) -> bool: seen = set() for i in range(9): for j in range(9): c = board[i][j] if c == '.': continue if c + '@row ' + str(i) in seen or \ c + '@col ' + str(j) in seen or \ c + '@box ' + str(i // 3) + str(j // 3) in seen: return False seen.add(c + '@row ' + str(i)) seen.add(c + '@col ' + str(j)) seen.add(c + '@box ' + str(i // 3) + str(j // 3)) return True
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