ValidSudoku
ValidSudoku.java 源码
package datastructure.array.leetcode;
/**
* 有效的数独
*/
public class ValidSudoku {
public boolean isValidSudoku(char[][] board) {
boolean[][] hor = new boolean[9][9];
boolean[][] ver = new boolean[9][9];
boolean[][] grid = new boolean[9][9];
for (int i = 0; i < 9; i++) {
for (int j = 0; j < 9; j++) {
if (board[i][j] != '.') {
int k = board[i][j] - '1';
if (hor[i][k] || ver[j][k] || grid[i / 3 * 3 + j / 3][k]) {
return false;
}
hor[i][k] = true;
ver[j][k] = true;
grid[i / 3 * 3 + j / 3][k] = true;
}
}
}
return true;
}
}
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