|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace leetcode; |
|
6
|
|
|
|
|
7
|
|
|
class AvailableCapturesForRook |
|
8
|
|
|
{ |
|
9
|
|
|
public static function numRookCaptures(array $board): int |
|
10
|
|
|
{ |
|
11
|
|
|
[$m, $n] = [count($board), empty($board[0]) ? 0 : count($board[0])]; |
|
12
|
|
|
if ($m === 0 || $n === 0) { |
|
13
|
|
|
return 0; |
|
14
|
|
|
} |
|
15
|
|
|
for ($i = 0; $i < $m; $i++) { |
|
16
|
|
|
for ($j = 0; $j < $n; $j++) { |
|
17
|
|
|
if ($board[$i][$j] === 'R') { |
|
18
|
|
|
return self::helper($board, $i, $j, 0, 1) |
|
19
|
|
|
+ self::helper($board, $i, $j, 0, -1) |
|
20
|
|
|
+ self::helper($board, $i, $j, 1, 0) |
|
21
|
|
|
+ self::helper($board, $i, $j, -1, 0); |
|
22
|
|
|
} |
|
23
|
|
|
} |
|
24
|
|
|
} |
|
25
|
|
|
|
|
26
|
|
|
return 0; |
|
27
|
|
|
} |
|
28
|
|
|
|
|
29
|
|
|
private static function helper(array $board, int $x, int $y, int $dx, int $dy): int |
|
30
|
|
|
{ |
|
31
|
|
|
[$m, $n] = [count($board), empty($board[0]) ? 0 : count($board[0])]; |
|
32
|
|
|
while ($x >= 0 && $x < $m && $y >= 0 && $y < $n && $board[$x][$y] !== 'B') { |
|
33
|
|
|
if ($board[$x][$y] === 'p') { |
|
34
|
|
|
return 1; |
|
35
|
|
|
} |
|
36
|
|
|
[$x, $y] = [$x + $dx, $y + $dy]; |
|
37
|
|
|
} |
|
38
|
|
|
|
|
39
|
|
|
return 0; |
|
40
|
|
|
} |
|
41
|
|
|
} |
|
42
|
|
|
|
imajinyun /
leetcode-php
