Question: Given a Node of a binary tree, find it's InOrder Successor.
BST * BST_successor(BST * node)
// If right-sub-tree exists, return the min of
//right-sub-tree, or say the leftest node.
if(node -> right)
return BST_min(node -> right);
// else, keep moving upwards, as long as the
// node is the right child of its parent
BST * p = node -> parent;
while(p && p -> right == node)
node = p;
p = node -> parent;
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