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copied!<p>OK, lefts give this a stab.</p> <p>I would go about it like this with some pseudo code</p> <pre><code>foreach leaf in knownLeafs parent = leaf.parent //get the leaf parent parent.total = parent.total + leaf.value //add leaf value to parent total while parent.parent != null //loop until no more parents, this would be the root { current = parent parent = parent.parent //move up the structure parent.total = parent.total + current.total } next leaf </code></pre> <p>you would need to create a function that will, given a node, return the parent node</p> <p>node GetParentNodeFrom(node)</p> <p>the new pseudo code would look something like this</p> <pre><code>foreach leaf in knownLeafs parent = GetParentNodeFrom(leaf) //get the leaf parent parent.total = parent.total + leaf.value //add leaf value to parent total while GetParentNodeFrom(parent) != null //loop until no more parents, this would be the root { current = parent parent = GetParentNodeFrom(current) //move up the structure parent.total = parent.total + current.total } next leaf </code></pre> <p>Sorry, my mistake, you should only move the leaf value up, not the totals too. See new leafValue used.</p> <pre><code>foreach leaf in knownLeafs parent = GetParentNodeFrom(leaf) //get the leaf parent leafValue = leaf.value parent.total = parent.total + leafValue //add leaf value to parent total while GetParentNodeFrom(parent) != null //loop until no more parents, this would be the root { current = parent parent = GetParentNodeFrom(current) //move up the structure parent.total = parent.total + leafValue } next leaf </code></pre>

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