we concretize the game tree algorithms with an iterator abstraction. In this exercise use the following state changing functions instead: move(v) Iterates all the possible moves from node v of player label(v) and returns nil when they are exhausted. apply(v, m) Returns the successor node of v for move m. cancel(u, m) Yields the parent node of u when move m is taken back. You can assume that a move is reversible (i.e. v = cancel(apply(v, m), m))

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Types of trees

A tree data structure is a non–linear structure that stores data hierarchically. It can be defined as a group of objects, called nodes. The nodes are linked with edges. Trees begin with a root node which leads to children nodes. The last children nodes (endpoints) are called leaf nodes, and they do not have children nodes.