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| 1 | +<?php |
| 2 | +class Solution |
| 3 | +{ |
| 4 | + public function maxPoints($grid, $queries) |
| 5 | + { |
| 6 | + $m = count($grid); |
| 7 | + $n = count($grid[0]); |
| 8 | + $queryCount = count($queries); |
| 9 | + |
| 10 | + $sortedQueries = []; |
| 11 | + foreach ($queries as $index => $query) { |
| 12 | + $sortedQueries[] = [$query, $index]; |
| 13 | + } |
| 14 | + sort($sortedQueries); |
| 15 | + |
| 16 | + |
| 17 | + $result = array_fill(0, $queryCount, 0); |
| 18 | + |
| 19 | + $pq = new SplPriorityQueue(); |
| 20 | + $pq->setExtractFlags(SplPriorityQueue::EXTR_DATA); |
| 21 | + |
| 22 | + |
| 23 | + $visited = array_fill(0, $m, array_fill(0, $n, false)); |
| 24 | + $pq->insert([0, 0, $grid[0][0]], -$grid[0][0]); // Use negative value for min-heap |
| 25 | + $visited[0][0] = true; |
| 26 | + |
| 27 | + $count = 0; |
| 28 | + |
| 29 | + $directions = [[0, 1], [0, -1], [1, 0], [-1, 0]]; |
| 30 | + |
| 31 | + $result = self::getSortResult($sortedQueries, $pq, $grid, $m, $n, $result, $count, $directions, $visited); |
| 32 | + |
| 33 | + return $result; |
| 34 | + } |
| 35 | + |
| 36 | + private static function getSortResult($sortedQueries, $pq, $grid, $m, $n, $result, $count, $directions, $visited) |
| 37 | + { |
| 38 | + foreach ($sortedQueries as [$query, $idx]) { |
| 39 | + while (! $pq->isEmpty() && $pq->top()[2] < $query) { |
| 40 | + list($r, $c, $value) = $pq->extract(); |
| 41 | + $count++; |
| 42 | + |
| 43 | + foreach ($directions as [$dr, $dc]) { |
| 44 | + $nr = $r + $dr; |
| 45 | + $nc = $c + $dc; |
| 46 | + |
| 47 | + if ($nr >= 0 && $nr < $m && $nc >= 0 && $nc < $n && ! $visited[$nr][$nc]) { |
| 48 | + $pq->insert([$nr, $nc, $grid[$nr][$nc]], -$grid[$nr][$nc]); |
| 49 | + $visited[$nr][$nc] = true; |
| 50 | + } |
| 51 | + } |
| 52 | + } |
| 53 | + $result[$idx] = $count; |
| 54 | + } |
| 55 | + |
| 56 | + return $result; |
| 57 | + } |
| 58 | +} |
| 59 | + |
| 60 | +// Example usage: |
| 61 | +$solution = new Solution(); |
| 62 | +$grid = [[1, 2, 4], [3, 4, 3], [2, 1, 1]]; |
| 63 | +$queries = [2, 3, 4]; |
| 64 | +print_r($solution->maxPoints($grid, $queries)); |
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