Decision tree builds classification or regression models in the form of a tree structure. It breaks down a dataset into smaller and smaller subsets while at the same time an associated decision tree is incrementally developed. The final result is a t

算法设计与分析中的任务分配问题。 用回溯法解该问题时，用完全n叉树表示解空间。可行性条件select 剪去不满足行、列约束的子树。递归方法 backtrack(1)实现对整个解空间的回溯搜索；backtrack(i)搜索解空间中的第i层子树，sum记录当前已找到的可行方案 数。在算法backtrack中，当i>n时，算法搜索至叶子结点，当前已找到的可行方案数sum加1；当i<=n时，当前扩展结点 Z是解空间中的内部结点。该结点有x[i]=1,2,...,n共n个

实现了在二叉树中找到定值的所有路径的结果。路径是指从根节点到叶子节点的所有节点。-Results found all paths to achieve a given value in the binary tree. Path refers to all nodes the root to the leaf nodes.