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题目： Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted i 阅读全文
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题目： Given a binary tree, flatten it to a linked list in-place. For example,Given The flattened tree should look like: 题目解答： 这个题目是将一个二叉树变成一个通过右子节点链接的链表 阅读全文
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题目： The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Besides the root, each 阅读全文