You know that really annoying problem where you can't think of a certain term, but doing a web search is fairly useless because you don't know what to look for

You know that really annoying problem where you can't think of a certain term, but doing a web search is fairly useless because you don't know what to look for (chicken and egg ?)... Googled "binary search find nth node" ... first three results are from SO, third one down [0], go down the page to find the term that I was looking for: "order statistics tree" [1]. [0] http://stackoverflow.com/questions/2329171/find-kth-smallest-element-in-a-binary-search-tree-in-optimum-way http://stackoverflow.com/questions/2329171/find-kth-smallest... [1] http://en.wikipedia.org/wiki/Order_statistic_tree http://en.wikipedia.org/wiki/Order_statistic_tree