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solution.js
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solution.js
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_u = require('underscore');
function findSolution(treearray) {
function pairs(numlist) {
var result = [];
for (var i = 0; i < numlist.length - 1; i++) {
result.push([numlist[i], numlist[i+1]]);
};
return result;
}
function biggestNodes(nodes) {
return pairs(nodes).map(function(pair) {
return _u.max(pair)
})
}
function sumToLast(tree, sumlevel) {
return _u.initial(tree).concat([_u.map(_u.last(tree), function(node, index) {
return node + sumlevel[index]
})]);
}
function getSum(tree) {
if (tree.length > 1)
return getSum(sumToLast(_u.initial(tree),
biggestNodes(_u.last(tree))) );
return _u.first(_u.flatten(tree));
}
// explicitly convert nodes to int
var tree = treearray.map(function(level) {
return level.map(function(node) { return parseInt(node) })
});
return getSum(tree);
}
// for node
exports.findSolution = findSolution;