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In this post, you will find the solution for the Sudoku Solver in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.
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Link for the Problem – Sudoku Solver– LeetCode Problem
Sudoku Solver– LeetCode Problem
Problem:
Write a program to solve a Sudoku puzzle by filling the empty cells.
A sudoku solution must satisfy all of the following rules:
- Each of the digits
1-9
must occur exactly once in each row. - Each of the digits
1-9
must occur exactly once in each column. - Each of the digits
1-9
must occur exactly once in each of the 93x3
sub-boxes of the grid.
The '.'
character indicates empty cells.
Example 1:
![Sudoku Solver 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: [["5","3","4","6","7","8","9","1","2"],["6","7","2","1","9","5","3","4","8"],["1","9","8","3","4","2","5","6","7"],["8","5","9","7","6","1","4","2","3"],["4","2","6","8","5","3","7","9","1"],["7","1","3","9","2","4","8","5","6"],["9","6","1","5","3","7","2","8","4"],["2","8","7","4","1","9","6","3","5"],["3","4","5","2","8","6","1","7","9"]] Explanation: The input board is shown above and the only valid solution is shown below:![]()
Constraints:
board.length == 9
board[i].length == 9
board[i][j]
is a digit or'.'
.- It is guaranteed that the input board has only one solution.
Sudoku Solver– LeetCode Solutions
class Solution { public: void solveSudoku(vector<vector<char>>& board) { solve(board, 0); } private: bool solve(vector<vector<char>>& board, int s) { if (s == 81) return true; const int i = s / 9; const int j = s % 9; if (board[i][j] != '.') return solve(board, s + 1); for (char c = '1'; c <= '9'; ++c) if (isValid(board, i, j, c)) { board[i][j] = c; if (solve(board, s + 1)) return true; board[i][j] = '.'; } return false; } bool isValid(vector<vector<char>>& board, int row, int col, char c) { for (int i = 0; i < 9; ++i) if (board[i][col] == c || board[row][i] == c || board[3 * (row / 3) + i / 3][3 * (col / 3) + i % 3] == c) return false; return true; } };
class Solution { public void solveSudoku(char[][] board) { dfs(board, 0); } private boolean dfs(char[][] board, int s) { if (s == 81) return true; final int i = s / 9; final int j = s % 9; if (board[i][j] != '.') return dfs(board, s + 1); for (char c = '1'; c <= '9'; ++c) if (isValid(board, i, j, c)) { board[i][j] = c; if (dfs(board, s + 1)) return true; board[i][j] = '.'; } return false; } private boolean isValid(char[][] board, int row, int col, char c) { for (int i = 0; i < 9; ++i) if (board[i][col] == c || board[row][i] == c || board[3 * (row / 3) + i / 3][3 * (col / 3) + i % 3] == c) return false; return true; } }
class Solution: def solveSudoku(self, board: List[List[str]]) -> None: def isValid(row: int, col: int, c: chr) -> bool: for i in range(9): if board[i][col] == c or \ board[row][i] == c or \ board[3 * (row // 3) + i // 3][3 * (col // 3) + i % 3] == c: return False return True def solve(s: int) -> bool: if s == 81: return True i = s // 9 j = s % 9 if board[i][j] != '.': return solve(s + 1) for c in string.digits[1:]: if isValid(i, j, c): board[i][j] = c if solve(s + 1): return True board[i][j] = '.' return False solve(0)
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