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Commit d2dd8a5

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solved: Sudoku Solver
1 parent 8f148a2 commit d2dd8a5

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2 files changed

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‎README.md‎

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@@ -332,4 +332,56 @@ List<bool> kidsWithCandies(List<int> candies, int extraCandies) {
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return result;
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}
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```
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### Sudoku Solver
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```dart
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void solveSudoku(List<List<String>> board) {
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_solver(board);
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}
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bool _solver(List<List<String>> board) {
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for (int i = 0; i < board.length; i++) {
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for (int j = 0; j < board.length; j++) {
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if (board[i][j] == '.') {
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for (int k = 1; k <= 9; k++) {
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if (_isValid(board, i, j, k)) {
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board[i][j] = '$k';
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if (_solver(board)) return true;
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}
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}
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board[i][j] = '.';
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return false;
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}
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}
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}
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print(board);
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return true;
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}
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bool _isValid(List<List<String>> board, int row, int col, int k) {
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for (int i = 0; i < 9; i++) {
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if (board[row][i] == '$k' || board[i][col] == '$k') {
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return false;
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}
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}
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final m = (col / 3).floor() * 3;
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final n = (row / 3).floor() * 3;
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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if (board[n + i][m + j] == '$k') {
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return false;
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}
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}
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}
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return true;
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}
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```

‎sudoku_solver.dart‎

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void main(List<String> args) {
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List<List<List<String>>> cases = [
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[
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["5", "3", ".", ".", "7", ".", ".", ".", "."],
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["6", ".", ".", "1", "9", "5", ".", ".", "."],
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[".", "9", "8", ".", ".", ".", ".", "6", "."],
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["8", ".", ".", ".", "6", ".", ".", ".", "3"],
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["4", ".", ".", "8", ".", "3", ".", ".", "1"],
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["7", ".", ".", ".", "2", ".", ".", ".", "6"],
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[".", "6", ".", ".", ".", ".", "2", "8", "."],
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[".", ".", ".", "4", "1", "9", ".", ".", "5"],
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[".", ".", ".", ".", "8", ".", ".", "7", "9"]
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],
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];
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for (final testcase in cases) {
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solveSudoku(testcase);
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}
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}
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void solveSudoku(List<List<String>> board) {
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_solver(board);
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}
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bool _solver(List<List<String>> board) {
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for (int i = 0; i < board.length; i++) {
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for (int j = 0; j < board.length; j++) {
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if (board[i][j] == '.') {
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for (int k = 1; k <= 9; k++) {
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if (_isValid(board, i, j, k)) {
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board[i][j] = '$k';
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if (_solver(board)) return true;
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}
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}
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board[i][j] = '.';
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return false;
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}
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}
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}
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print(board);
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return true;
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}
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bool _isValid(List<List<String>> board, int row, int col, int k) {
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for (int i = 0; i < 9; i++) {
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if (board[row][i] == '$k' || board[i][col] == '$k') {
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return false;
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}
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}
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final m = (col / 3).floor() * 3;
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final n = (row / 3).floor() * 3;
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for (int i = 0; i < 3; i++) {
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for (int j = 0; j < 3; j++) {
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if (board[n + i][m + j] == '$k') {
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return false;
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}
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}
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}
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return true;
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}

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