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1030-matrix-cells-in-distance-order.php
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<?php
// 1030. Matrix Cells in Distance Order
// https://leetcode.com/problems/matrix-cells-in-distance-order/
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 108 ms, faster than 50.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 27.8 MB, less than 20.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// class Solution
// {
// function distance($originRow, $originCol, $hereRow, $hereCol)
// {
// return abs($originRow - $hereRow) + abs($originCol - $hereCol);
// }
// function cellsWithDistance($rowCount, $colCount, $rowIndex, $colIndex)
// {
// $result = [];
// for ($i = 0; $i <= $rowCount - 1; $i++) {
// for ($j = 0; $j <= $colCount - 1; $j++) {
// $result[] = [$i, $j, self::distance($rowIndex, $colIndex, $i, $j)];
// }
// }
// return $result;
// }
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $cells = self::cellsWithDistance($R, $C, $r0, $c0);
// usort($cells, function ($a, $b) {
// return $a[2] - $b[2];
// });
// return array_map(function ($c) {
// return [$c[0], $c[1]];
// }, $cells);
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 112 ms, faster than 33.33% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 25.7 MB, less than 20.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// class Solution
// {
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $result = [];
// $byDistance = [];
// for ($rI = 0; $rI <= $R - 1; $rI++) {
// for ($cI = 0; $cI <= $C - 1; $cI++) {
// $distance = abs($r0 - $rI) + abs($c0 - $cI);
// if (!isset($byDistance[$distance])) $byDistance[$distance] = [];
// array_push($byDistance[$distance], [$rI, $cI]);
// }
// }
// ksort($byDistance, SORT_NUMERIC);
// // echo '<pre>', print_r($byDistance, true), '</pre>';
// foreach ($byDistance as $atDistance) {
// $result = array_merge($result, $atDistance);
// }
// // echo '<pre>', print_r($result, true), '</pre>';
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 80 ms, faster than 100.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 24.4 MB, less than 60.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// class Solution
// {
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $result = [];
// $byDistance = [];
// for ($rI = 0; $rI <= $R - 1; $rI++) {
// for ($cI = 0; $cI <= $C - 1; $cI++) {
// $distance = abs($r0 - $rI) + abs($c0 - $cI);
// if (!isset($byDistance[$distance])) $byDistance[$distance] = [];
// array_push($byDistance[$distance], [$rI, $cI]);
// }
// }
// ksort($byDistance, SORT_NUMERIC);
// foreach ($byDistance as $atDistance) {
// foreach ($atDistance as $cell) {
// $result[] = $cell;
// }
// }
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 112 ms, faster than 33.33% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 24.5 MB, less than 60.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// class Solution
// {
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $result = [];
// for ($rI = 0, $R--, $C--; $rI <= $R; $rI++) {
// for ($cI = 0; $cI <= $C; $cI++) {
// $result[] = [$rI, $cI, abs($r0 - $rI) + abs($c0 - $cI)];
// }
// }
// usort($result, function ($a, $b) {
// return $a[2] - $b[2];
// });
// foreach ($result as &$cell) {
// array_pop($cell);
// }
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 104 ms, faster than 50.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 24.5 MB, less than 60.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// class Solution
// {
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $result = [];
// for ($rI = 0, $R--, $C--; $rI <= $R; $rI++) {
// for ($cI = 0; $cI <= $C; $cI++) {
// $result[] = [$rI, $cI, abs($r0 - $rI) + abs($c0 - $cI)];
// }
// }
// usort($result, function ($a, $b) {
// return $a[2] - $b[2];
// });
// foreach ($result as &$cell) {
// $cell = [$cell[0], $cell[1]];
// }
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 76 ms, faster than 100.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 23.4 MB, less than 100.00% of PHP online submissions
// for Matrix Cells in Distance Order.
/*
* This feels excessively clever
*/
// class Solution
// {
// /**
// * @param Integer $R
// * @param Integer $C
// * @param Integer $r0
// * @param Integer $c0
// * @return Integer[][]
// */
// function allCellsDistOrder($R, $C, $r0, $c0)
// {
// $result = [];
// $max = $R * $C;
// for ($rI = $i = 0, $R--, $C--; $rI <= $R; $rI++) {
// for ($cI = 0; $cI <= $C; $cI++, $i++) {
// $distance = abs($r0 - $rI) + abs($c0 - $cI);
// $result[$distance * $max + $i] = [$rI, $cI];
// }
// }
// ksort($result, SORT_NUMERIC);
// echo '<pre>', print_r($result, true), '</pre>';
// return $result;
// }
// }
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Runtime: 72 ms, faster than 100.00% of PHP online submissions
// for Matrix Cells in Distance Order.
// Memory Usage: 23.5 MB, less than 100.00% of PHP online submissions
// for Matrix Cells in Distance Order.
class Solution
{
/**
* @param Integer $R
* @param Integer $C
* @param Integer $r0
* @param Integer $c0
* @return Integer[][]
*/
function allCellsDistOrder($R, $C, $r0, $c0)
{
$result = [];
for ($rI = $i = 0; $rI <= $R - 1; $rI++) {
for ($cI = 0; $cI <= $C - 1; $cI++, $i++) {
$distance = abs($r0 - $rI) + abs($c0 - $cI);
$result[$distance * $C * $R + $i] = [$rI, $cI];
}
}
ksort($result, SORT_NUMERIC);
return $result;
}
}
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
$tests = [
[
'name' => 'Example 1',
// [0, 0], [0, 1]
'input' => [
'R' => 1,
'C' => 2,
'r0' => 0,
'c0' => 0,
],
'expected' => [[0, 0], [0, 1]],
],
[
'name' => 'Example 2',
// [0, 0], [0, 1]
// [1, 0], [1, 1]
'input' => [
'R' => 2,
'C' => 2,
'r0' => 0,
'c0' => 1,
],
'expected' => [[0, 1], [0, 0], [1, 1], [1, 0]],
],
[
'name' => 'Example 3',
// [0, 0], [0, 1], [0, 2]
// [1, 0], [1, 1], [1, 2]
'input' => [
'R' => 2,
'C' => 3,
'r0' => 1,
'c0' => 2,
],
'expected' => [[1, 2], [0, 2], [1, 1], [0, 1], [1, 0], [0, 0]],
],
];
$s = new Solution();
foreach ($tests as $test) {
extract($test);
extract($input);
$output = $s->allCellsDistOrder($R, $C, $r0, $c0);
if ($expected === $output) {
echo "✅ {$name}<br>";
} else {
echo "🔴 {$name}<br>";
// echo 'Expected the below<br>';
// echo '<pre>', print_r($expected, true), '</pre>';
// echo 'But got the beow instead<br>';
// echo '<pre>', print_r($output, true), '</pre>';
}
}