39 lines
1.0 KiB
PHP
39 lines
1.0 KiB
PHP
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<?php
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foreach(file('php://stdin') as $line) {
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$matrix[] = explode(' ', $line);
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}
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$max = 0;
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//Left and right
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for ($y = 0; $y < 19; $y++) {
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for ($x = 0; $x < 16; $x++) {
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$cmp = $matrix[$y][$x] * $matrix[$y][$x + 1] * $matrix[$y][$x + 2] * $matrix[$y][$x + 3];
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$max = ($cmp > $max) ? $cmp : $max;
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}
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}
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//Vertical
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for($x = 0; $x < 19; $x++) {
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for ($y = 0; $y < 16; $y++) {
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$cmp = $matrix[$y][$x] * $matrix[$y + 1][$x] * $matrix[$y + 2][$x] * $matrix[$y + 3][$x];
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$max = ($cmp > $max) ? $cmp : $max;
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}
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}
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//Diagonally left->down
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for($x = 0; $x < 16; $x++) {
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for ($y = 0; $y < 16; $y++) {
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$cmp = $matrix[$y][$x] * $matrix[$y + 1][$x + 1] * $matrix[$y + 2][$x + 2] * $matrix[$y + 3][$x + 3];
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$max = ($cmp > $max) ? $cmp : $max;
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}
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}
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//Diagonally right->down
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for($x = 4; $x < 19; $x++) {
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for ($y = 0; $y < 16; $y++) {
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$cmp = $matrix[$y][$x] * $matrix[$y + 1][$x - 1] * $matrix[$y + 2][$x - 2] * $matrix[$y + 3][$x - 3];
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$max = ($cmp > $max) ? $cmp : $max;
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}
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}
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echo $max;
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