fizbin,
You have missed that I reversed the ordering of the string. As is, there is no way to have two adds with the same percentage nor is there a straight forward way of determining the percentage of any given add. I was trying to be creative, provide a significant speed increase, and maintain manageability.

Additionally, your code is unfair. In your benchmark, all solutions are being timed for creating a structure to return an add and then returning that add each time. The trouble is that, in my method (and others), we only have to invest that time once because we do not destroy it but your solution does. You would need to alter the bench to be fair.

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