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题目: Given a binary tree Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set to 阅读全文
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题目: Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example,Given n = 3, your program should return 阅读全文
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题目: Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique 阅读全文
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题目: Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains 阅读全文
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题目要求: Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing its structure. 给出一棵二叉树,其中有两个结点交换了位置,要求找出这两个 阅读全文
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题目: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity 思路1: 依次归并排序,首先归并前两个,然后归并完成的链表依次和剩下的链表进行归并排序 时间复杂 阅读全文
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题目要求: Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You must do this in-place without altering the nodes' valu 阅读全文