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problem011.js
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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 un = require('underscore');
isValidRowIndex = function(index, rowLength, count){
return (index % rowLength) <= (rowLength - count);
}
isValidColumnIndex = function(index, rowLength, count){
return Math.floor(index / rowLength) <= (rowLength - count);
}
function horizontal(array, index, rowLength, count){
return isValidRowIndex(index, rowLength, count) ?
un.reduce(un.range(index, index + count), function(memo, num){
return memo * array[num];
}, 1) :
0;
}
function vertical(array, index, rowLength, count){
return isValidColumnIndex(index, rowLength, count) ?
un.reduce(un.range(index, index + (3 * rowLength) + 1, rowLength), function(memo, num){
return memo * array[num];
},1) :
0;
}
function slash(array, index, rowLength, count){
return isValidRowIndex(index, rowLength, count) && isValidColumnIndex(index, rowLength, count) ?
un.reduce(un.range(index + 3, index + (3 * rowLength) + 1, rowLength - 1), function(memo, num){
return memo * array[num];
},1) :
0;
}
function backslash(array, index, rowLength, count){
return isValidRowIndex(index, rowLength, count) && isValidColumnIndex(index, rowLength, count) ?
un.reduce(un.range(index, index + (3 * rowLength) + 4, rowLength + 1), function(memo, num){
return memo * array[num];
},1) :
0;
}
function gridMax(array, index, rowLength, count){
return un.max([
horizontal(array, index, rowLength, count),
vertical(array, index, rowLength, count),
slash(array, index, rowLength, count),
backslash(array, index, rowLength, count)
]);
}
exports.horizontal = horizontal;
exports.vertical = vertical;
exports.slash = slash;
exports.backslash = backslash;
exports.gridMax = gridMax;
exports.getSolution = function(){
return un.reduce(grid, function(memo, value, index, list){
var temp = gridMax(list, index, 20, 4);
return temp > memo ? temp : memo;
}, 0);
}