Lintcode453 Flatten Binary Tree to Linked List solution 题解
【题目描述】Flattenabinarytreetoafake"linkedlist"inpre-ordertraversal.HereweusetherightpointerinTreeNodeasthenextpointerinListNode.NoticeDon'tforgettomarktheleftchildofeachnodetonull.OryouwillgetTimeLimitEx