leetcode helper -- binary tree adapter and list adapter
leetcode 常常以列表的形式给出一个二叉树或链表，为了方便本地调试程序，故随手写出 solution.hpp 用来完成二叉树和链表的构造。
TreeAdapter _ta({1,2,2,3,3,null,null,4,4});
ListAdapter _la({5,2,13,3,8});
const TreeNode* _pt_root = _ta.root;
const ListNode* _pl_head = _la.head;
std::cout << _ta << std::endl;
std::cout << _la << std::endl;简单，无需多言
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