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Refactor Hard/sudoku-solver/Solution.java

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This commit is contained in:
Arkaprabha Chakraborty
2022-07-28 10:55:56 +05:30
parent cef4c4dcc4
commit d5e212b7ce
1 changed files with 25 additions and 14 deletions
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39
Hard/sudoku-solver/Solution.java
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@@ -1,57 +1,68 @@
class Solution { class Solution {
char[][] BOARD; char[][] Board;
boolean isValid(int row, int col, char num) { boolean isValid(int row, int col, char num) {
for (int i = 0; i < 9; i++) { for (int i = 0; i < 9; i++) {
if (BOARD[i][col] == num) if (Board[i][col] == num) {
return false; return false;
if (BOARD[row][i] == num) }
if (Board[row][i] == num) {
return false; return false;
}
} }
row = row - row % 3; row = row - row % 3;
col = col - col % 3; col = col - col % 3;
for (int i = 0; i < 3; i++) for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) for (int j = 0; j < 3; j++) {
if (BOARD[i + row][j + col] == num) if (Board[i + row][j + col] == num) {
return false; return false;
}
}
}
return true; return true;
} }
int[] nextEmpty() { int[] nextEmpty() {
for (int i = 0; i < 9; i++) for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) for (int j = 0; j < 9; j++) {
if (BOARD[i][j] == '.') if (Board[i][j] == '.') {
return new int[] { i, j }; return new int[] { i, j };
}
}
}
return new int[] { -1, -1 }; return new int[] { -1, -1 };
} }
boolean solver() { boolean solver() {
int[] tmp = nextEmpty(); int[] tmp = nextEmpty();
if (tmp[0] == -1) if (tmp[0] == -1) {
return true; return true;
}
int row = tmp[0]; int row = tmp[0];
int col = tmp[1]; int col = tmp[1];
for (int i = 1; i <= 9; i++) { for (int i = 1; i <= 9; i++) {
if (isValid(row, col, (char) (48 + i))) { if (isValid(row, col, (char) (48 + i))) {
BOARD[row][col] = (char) (48 + i); Board[row][col] = (char) (48 + i);
if (solver()) if (solver()) {
return true; return true;
}
} }
BOARD[row][col] = '.'; Board[row][col] = '.';
} }
return false; return false;
} }
public void solveSudoku(char[][] board) { public void solveSudoku(char[][] board) {
BOARD = board; Board = board;
solver(); solver();
} }
} }