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4a77c7f258
The core functionalities are now in two general functions `extremeInSubtreeOnDirection()` and `nextOnDirection()` so all the other traversing functions (`getMin()`, `getMax()`, and `InorderIterator`) are all just trivial calls to these core functions. The added two functions `Node.next()` and `Node.prev()` are also just trivial calls to these. * std.Treap traversal direction: use u1 instead of usize. * Treap: fix getMin() and getMax(), and add tests for them.