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| 1 | +class Solution { |
| 2 | + |
| 3 | + /** |
| 4 | + * @param String[][] $board |
| 5 | + * @return Boolean |
| 6 | + */ |
| 7 | + function isValidSudoku($board) { |
| 8 | + $list = []; |
| 9 | + for ($i = 0; $i < 9; $i++){ |
| 10 | + for ($j = 0; $j < 9; $j++){ |
| 11 | + $c = $board[$i][$j]; |
| 12 | + if ($c == '.') continue; |
| 13 | + if (in_array($c, $list)) return false; |
| 14 | + $list[] = $c; |
| 15 | + } |
| 16 | + $list = []; |
| 17 | + } |
| 18 | + for ($i = 0; $i < 9; $i++){ |
| 19 | + for ($j = 0; $j < 9; $j++){ |
| 20 | + $c = $board[$j][$i]; |
| 21 | + if ($c == '.') continue; |
| 22 | + if (in_array($c, $list)) return false; |
| 23 | + $list[] = $c; |
| 24 | + } |
| 25 | + $list = []; |
| 26 | + } |
| 27 | + for ($i = 0; $i < 3; $i++){ |
| 28 | + for ($j = 0; $j < 3; $j++){ |
| 29 | + for ($x = 3*$i; $x < 3+3*$i; $x++){ |
| 30 | + for ($y = 3*$j; $y < 3+3*$j; $y++){ |
| 31 | + $c = $board[$x][$y]; |
| 32 | + if ($c == '.') continue; |
| 33 | + if (in_array($c, $list)) return false; |
| 34 | + $list[] = $c; |
| 35 | + } |
| 36 | + } |
| 37 | + $list = []; |
| 38 | + } |
| 39 | + } |
| 40 | + return true; |
| 41 | + } |
| 42 | +} |
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