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e11.php
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e11.php
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<?php
$matrix = array(array(08,02,22,97,38,15,00,40,00,75,04,05,07,78,52,12,50,77,91,08),array(49,49,99,40,17,81,18,57,60,87,17,40,98,43,69,48,04,56,62,00),array(81,49,31,73,55,79,14,29,93,71,40,67,53,88,30,03,49,13,36,65),array(52,70,95,23,04,60,11,42,69,24,68,56,01,32,56,71,37,02,36,91),array(22,31,16,71,51,67,63,89,41,92,36,54,22,40,40,28,66,33,13,80),array(24,47,32,60,99,03,45,02,44,75,33,53,78,36,84,20,35,17,12,50),array(32,98,81,28,64,23,67,10,26,38,40,67,59,54,70,66,18,38,64,70),array(67,26,20,68,02,62,12,20,95,63,94,39,63,08,40,91,66,49,94,21),array(24,55,58,05,66,73,99,26,97,17,78,78,96,83,14,88,34,89,63,72),array(21,36,23,09,75,00,76,44,20,45,35,14,00,61,33,97,34,31,33,95),array(78,17,53,28,22,75,31,67,15,94,03,80,04,62,16,14,09,53,56,92),array(16,39,05,42,96,35,31,47,55,58,88,24,00,17,54,24,36,29,85,57),array(86,56,00,48,35,71,89,07,05,44,44,37,44,60,21,58,51,54,17,58),array(19,80,81,68,05,94,47,69,28,73,92,13,86,52,17,77,04,89,55,40),array(04,52,08,83,97,35,99,16,07,97,57,32,16,26,26,79,33,27,98,66),array(88,36,68,87,57,62,20,72,03,46,33,67,46,55,12,32,63,93,53,69),array(04,42,16,73,38,25,39,11,24,94,72,18,08,46,29,32,40,62,76,36),array(20,69,36,41,72,30,23,88,34,62,99,69,82,67,59,85,74,04,36,16),array(20,73,35,29,78,31,90,01,74,31,49,71,48,86,81,16,23,57,05,54),array(01,70,54,71,83,51,54,69,16,92,33,48,61,43,52,01,89,19,67,48));
$maxProd = 0;
for ($i = 0; $i < count($matrix); $i+=1) {
for ($j = 0; $j < count($matrix[$i]); $j+=1) {
if ($i + 3 < count($matrix)) {
$maxProd = max($matrix[$i][$j]*$matrix[$i+1][$j]*$matrix[$i+2][$j]*$matrix[$i+3][$j], $maxProd);
}
if ($j + 3 < count($matrix[$i])) { // left/right
$maxProd = max($matrix[$i][$j]*$matrix[$i][$j+1]*$matrix[$i][$j+2]*$matrix[$i][$j+3], $maxProd);
}
if ($i + 3 < count($matrix) && $j+3 < count($matrix[$i])) {
$maxProd = max($matrix[$i][$j]*$matrix[$i+1][$j+1]*$matrix[$i+2][$j+2]*$matrix[$i+3][$j+3], $maxProd);
}
if ($i + 3 < count($matrix) && $j >= 3) {
$maxProd = max($matrix[$i][$j]*$matrix[$i+1][$j-1]*$matrix[$i+2][$j-2]*$matrix[$i+3][$j-3], $maxProd);
}
}
}
echo $maxProd;
?>