You can think of the left and right pointers as synonymous to the predecessor and successor pointers in a doubly-linked list. For a circular doubly linked list, the predecessor of the first element is the last element, and the successor of the last element is the first element. We want to...
33. Search in Rotated Sorted Array # 题目# Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]). You are given a target value to search. If found in the array return its ...
publicclassSolution {publicList<String>restoreIpAddresses(String s) { List<String> res =newArrayList<String>();intlen =s.length();for(inti = 1; i<4 && i<len-2; i++){for(intj = i+1; j<i+4 && j<len-1; j++){for(intk = j+1; k<j+4 && k<len; k++){ String s1= s....
https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/ 题目: Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 思路: 简单起见,先把链表值存到数组中,用数组递归感觉会简单点。。 算法: public int getListLength(ListNod...
0378-Kth-Smallest-Element-in-a-Sorted-Matrix 0380-Insert-Delete-GetRandom-O(1) 0381-Insert-Delete-GetRandom-O(1)-Duplicates-allowed 0382-Linked-List-Random-Node 0384-Shuffle-an-Array 0386-Lexicographical-Numbers 0387-First-Unique-Character-in-a-String 0388-Longest-Abso...
We want to do the transformation in place. After the transformation, the left pointer of the tree node should point to its predecessor, and the right pointer should point to its successor. You should return the pointer to the smallest element of the linked list. ...
Leetcode98.Validate_Binary_Search_Tree 对于二叉搜索树的任意一个节点,其值应满足:向上回溯,第一个向左的节点,是其下界;第一个向右的结点,是其上界。 例如: 从‘14’向上回溯,第一个向左的结点是‘13’,第一个向右的结点是‘14’,所以‘14’的位置正确。 那么,我们反过来,从上向下看,就有:左儿子的父...
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74. Search a 2D Matrix # 题目 # Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted from left to right. The first integer of each row is greater than the
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees ofeverynode never differ by more than 1. Example: Given the sorted linked list: [-10,-3,0,5,9], One possible answer is: [0,-3,9,-10,null,5], which represents ...