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IsValidSudoku.java
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IsValidSudoku.java
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import java.util.*;
public class IsValidSudoku {
public static boolean isValid1(char[][] board) {
int size = board.length;
Hashtable<Character, Boolean> table = new Hashtable<Character, Boolean> ();
for (int i = 0; i < size; i++) {
for (int j = 0; j < size; j++) {
char e = board[i][j];
if (e != '.') {
if (table.containsKey(board[i][j])) return false;
else {
table.put(board[i][j], true);
}
}
}
}
return true;
}
public static boolean isValid2(char[][] board) {
int size = board.length;
for (int i = 0; i < size; i++) {
Hashtable<Character, Boolean> line = new Hashtable<Character, Boolean> ();
for (int j = 0; j < size; j++) {
char e = board[i][j];
if (e != '.') {
if (line.containsKey(board[i][j])) return false;
else {
line.put(board[i][j], true);
}
}
}
}
for (int j = 0; j < size; j++) {
Hashtable<Character, Boolean> line = new Hashtable<Character, Boolean> ();
for (int i = 0; i < size; i++) {
char e = board[i][j];
if (e != '.') {
if (line.containsKey(board[i][j])) return false;
else line.put(board[i][j], true);
}
}
}
return true;
}
public static boolean isValidSudoku(char[][] board) {
ArrayList<char[][]> table = new ArrayList<char[][]>();
for (int i = 0; i < 9; i++){
table.add(new char[3][3]);
int row = i / 3;
int col = i % 3;
for (int j = 0; j < 3; j++) {
for (int k = 0; k < 3; k++) {
table.get(i)[j][k] = board[3 * row + j][3 * col + k];
}
}
if (!isValid1(table.get(i))) return false;
}
return isValid2(board);
}
public static void main(String[] args) {
String[] str = {
".87654321",
"2........",
"3........",
"4........","5........","6........","7........","8........","9........"
};
char[][] board = new char[9][9];
for (int i = 0; i < 9; i++) {
board[i] = str[i].toCharArray();
}
System.out.println(isValidSudoku(board));
}
}