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<?php |
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namespace drupol\phpartition\Algorithm; |
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use drupol\phpartition\BasePartitionAlgorithm; |
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use drupol\phpartition\Partition; |
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use drupol\phpartition\PartitionAlgorithmInterface; |
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use drupol\phpermutations\Permutations; |
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/** |
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* Class BruteForce. |
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* |
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* @package drupol\phpartition\Algorithm |
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*/ |
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class BruteForce extends BasePartitionAlgorithm implements PartitionAlgorithmInterface { |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getResult() { |
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$this->getDataPartition()->sortByValue('ASC'); |
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$partitionSize = ($this->getSize() > $this->getDataPartition()->count()) ? $this->getDataPartition()->count() : $this->getSize(); |
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for ($p = $partitionSize; $p > 1; $p--) { |
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$best = $this->getDataPartition()->getWeight(); |
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$target = ($best) / $p; |
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$goodSubset = array(); |
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$maxSize = floor($this->getDataPartition()->count() / $p); |
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for ($i = 1; $i <= $maxSize; $i++) { |
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$permutations = new Permutations($this->getDataPartition()->values(), $i); |
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foreach ($permutations->generator() as $subset) { |
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$x = 0; |
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foreach ($subset as $item) { |
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$x += $item->getValue(); |
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if (abs($x - $target) - abs($best - $target) < 0) { |
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$best = $x; |
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$goodSubset = $subset; |
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} |
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} |
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} |
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} |
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$partition = new Partition(); |
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$partition->setAlgo($this); |
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$partition->addItems($goodSubset); |
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$this->getPartitionContainer()->insert($partition); |
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$this->getDataPartition()->deleteItems($goodSubset); |
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} |
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$partition = new Partition(); |
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$partition->setAlgo($this); |
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$partition->addItems($this->getDataPartition()->all()); |
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$this->getPartitionContainer()->insert($partition); |
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return $this->getPartitionContainer()->getPartitionsItemsArray(); |
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} |
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} |
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drupol /
phpartition
