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Memory optimisation #2

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Memory optimisation #2

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6 changes: 3 additions & 3 deletions src/MatchesSolver.php
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Original file line number Diff line number Diff line change
Expand Up @@ -22,10 +22,10 @@ protected function newIndex(array $matrix, int $i, int $j)
{
return new Match(
[
$i - $matrix[$i][$j] + 1,
$j - $matrix[$i][$j] + 1,
$i - $matrix[$i%2][$j] + 1,
$j - $matrix[$i%2][$j] + 1,
],
$matrix[$i][$j]
$matrix[$i%2][$j]
);
}

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16 changes: 8 additions & 8 deletions src/Solver.php
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ class Solver implements SolverInterface
*/
protected function newIndex(array $matrix, int $i, int $j)
{
return $i - $matrix[$i][$j] + 1;
return $i - $matrix[$i%2][$j] + 1;
}

/**
Expand Down Expand Up @@ -58,28 +58,28 @@ public function solve(string $stringA, string $stringB)
$charsA = str_split($stringA);
$charsB = str_split($stringB);

$matrix = array_fill_keys(array_keys($charsA), array_fill_keys(array_keys($charsB), 0));
$matrix = array_fill_keys([0, 1], array_fill_keys(array_keys($charsB), 0));
$longestLength = 0;
$longestIndexes = [];

foreach ($charsA as $i => $charA) {
foreach ($charsB as $j => $charB) {
if ($charA === $charB) {
if (0 === $i || 0 === $j) {
$matrix[$i][$j] = 1;
$matrix[$i%2][$j] = 1;
} else {
$matrix[$i][$j] = $matrix[$i - 1][$j - 1] + 1;
$matrix[$i%2][$j] = $matrix[($i-1)%2][$j - 1] + 1;
}

$newIndex = $this->newIndex($matrix, $i, $j);
if ($matrix[$i][$j] > $longestLength) {
$longestLength = $matrix[$i][$j];
if ($matrix[$i%2][$j] > $longestLength) {
$longestLength = $matrix[$i%2][$j];
$longestIndexes = [$newIndex];
} elseif ($matrix[$i][$j] === $longestLength) {
} elseif ($matrix[$i%2][$j] === $longestLength) {
$longestIndexes[] = $newIndex;
}
} else {
$matrix[$i][$j] = 0;
$matrix[$i%2][$j] = 0;
}
}
}
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