var grid = [[08,02,22,97,38,15,00,40,00,75,04,05,07,78,52,12,50,77,91,08],[49,49,99,40,17,81,18,57,60,87,17,40,98,43,69,48,04,56,62,00],[81,49,31,73,55,79,14,29,93,71,40,67,53,88,30,03,49,13,36,65],[52,70,95,23,04,60,11,42,69,24,68,56,01,32,56,71,37,02,36,91],[22,31,16,71,51,67,63,89,41,92,36,54,22,40,40,28,66,33,13,80],[24,47,32,60,99,03,45,02,44,75,33,53,78,36,84,20,35,17,12,50],[32,98,81,28,64,23,67,10,26,38,40,67,59,54,70,66,18,38,64,70],[67,26,20,68,02,62,12,20,95,63,94,39,63,08,40,91,66,49,94,21],[24,55,58,05,66,73,99,26,97,17,78,78,96,83,14,88,34,89,63,72],[21,36,23,09,75,00,76,44,20,45,35,14,00,61,33,97,34,31,33,95],[78,17,53,28,22,75,31,67,15,94,03,80,04,62,16,14,09,53,56,92],[16,39,05,42,96,35,31,47,55,58,88,24,00,17,54,24,36,29,85,57],[86,56,00,48,35,71,89,07,05,44,44,37,44,60,21,58,51,54,17,58],[19,80,81,68,05,94,47,69,28,73,92,13,86,52,17,77,04,89,55,40],[04,52,08,83,97,35,99,16,07,97,57,32,16,26,26,79,33,27,98,66],[88,36,68,87,57,62,20,72,03,46,33,67,46,55,12,32,63,93,53,69],[04,42,16,73,38,25,39,11,24,94,72,18,08,46,29,32,40,62,76,36],[20,69,36,41,72,30,23,88,34,62,99,69,82,67,59,85,74,04,36,16],[20,73,35,29,78,31,90,01,74,31,49,71,48,86,81,16,23,57,05,54],[01,70,54,71,83,51,54,69,16,92,33,48,61,43,52,01,89,19,67,48]];
var largest = 0;
for(var i = 0;i<20;i++){
for(var j = 0;j<20;j++){
var val = getlargest(i,j,grid);
if(val > largest ) largest = val;
}
}
document.write("Euler #11 Javascript: "+largest+"
");
function getlargest(i,j,grid){
var largest = 0;
if(i-3 >= 0) var u = grid[i][j]*grid[i-1][j]*grid[i-2][j]*grid[i-3][j];
largest = u;
if(i+3 <= 19) var d = grid[i][j]*grid[i+1][j]*grid[i+2][j]*grid[i+3][j];
if(d>largest) largest = d;
if(j-3 >= 0) var l = grid[i][j]*grid[i][j-1]*grid[i][j-2]*grid[i][j-3];
if(l>largest) largest = l;
if(i+3 <= 19) var r = grid[i][j]*grid[i][j+1]*grid[i][j+2]*grid[i][j+3];
if(r>largest) largest = r;
if(i-3 >= 0 && j-3 >= 0) var ur = grid[i][j]*grid[i-1][j+1]*grid[i-2][j+2]*grid[i-3][j+3];
if(ur>largest) largest = ur;
if(i-3 >= 0 && j+3 <= 19) var ul = grid[i][j]*grid[i-1][j-1]*grid[i-2][j-2]*grid[i-3][j-3];
if(ul>largest) largest = ul;
if(i+3 <= 19 && j+3 <= 19) var dr = grid[i][j]*grid[i+1][j+1]*grid[i+2][j+2]*grid[i+3][j+3];
if(dr>largest) largest = dr;
if(i+3 <= 19 && j-3 >= 0) var dl = grid[i][j]*grid[i+1][j-1]*grid[i+2][j-2]*grid[i+3][j-3];
if(dl>largest) largest = dl;
return largest;
}
Euler Problem #11:
70600674 total time: 0sec
$i = 0;
$gridString = "08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48";
$rows = explode("\n",$gridString);
foreach($rows as $row){
$row = explode(" ",$row);
$grid[$i] = $row;
$i++;
}
$largest = 0;
for($i=0;$i<20;$i++){
for($j=0;$j<20;$j++){
$val = largest($i,$j);
if($val > $largest) $largest = $val;
}
}
function largest($i,$j){
global $grid;
$largest = 0;
$u = $grid[$i][$j]*$grid[$i-1][$j]*$grid[$i-2][$j]*$grid[$i-3][$j];
$largest = $u;
$d = $grid[$i][$j]*$grid[$i+1][$j]*$grid[$i+2][$j]*$grid[$i+3][$j];
if($d>$largest) $largest = $d;
$l = $grid[$i][$j]*$grid[$i][$j-1]*$grid[$i][$j-2]*$grid[$i][$j-3];
if($l>$largest) $largest = $l;
$r = $grid[$i][$j]*$grid[$i][$j+1]*$grid[$i][$j+2]*$grid[$i][$j+3];
if($r>$largest) $largest = $r;
$ur = $grid[$i][$j]*$grid[$i-1][$j+1]*$grid[$i-2][$j+2]*$grid[$i-3][$j+3];
if($ur>$largest) $largest = $ur;
$ul = $grid[$i][$j]*$grid[$i-1][$j-1]*$grid[$i-2][$j-2]*$grid[$i-3][$j-3];
if($ul>$largest) $largest = $ul;
$dr = $grid[$i][$j]*$grid[$i+1][$j+1]*$grid[$i+2][$j+2]*$grid[$i+3][$j+3];
if($dr>$largest) $largest = $dr;
$dl = $grid[$i][$j]*$grid[$i+1][$j-1]*$grid[$i+2][$j-2]*$grid[$i+3][$j-3];
if($dl>$largest) $largest = $dl;
return $largest;
}
echo $largest;