直接上代码 /** * Created by lvhao on 2017/6/30. * 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 arra…

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 index, otherwise return -1. You…

Follow up for "Search in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 这道是之前那道Search in Rotated Sorted Array 在旋转有序数组…

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,0,1,2,2,5,6] might become [2,5,6,0,0,1,2]). You are given a target value to search. If found in the array return true, otherwise return false. Ex…

Follow up for "Search in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4…

Level:   Medium 题目描述: 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 index,…

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). Find the minimum element. You may assume no duplicate exists in the array. 题目标签:Array, Binary Search 题目给了…

Follow up for "Find Minimum in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might be…

[033-Search in Rotated Sorted Array(在旋转数组中搜索)] [LeetCode-面试算法经典-Java实现][全部题目文件夹索引] 原题 Suppose a sorted array 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.…

Follow up for "Find Minimum in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might be…

  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]). Find the minimum element. The array may contain duplicates. Example 1: Input: [1,3,5] Output: 1 E…

题目: Follow up for "Search in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 说明: 1)和1比只是有重复的数字,整体仍采用二分查找 2)方法二 : 实现:  …

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]). Find the minimum element. The array may contain duplicates. Example 1: Input: [1,3,5] Output: 1…

二分查找算法以及旋转之后的数组二分查找算法: #!/usr/local/bin/python3 # -*- coding: utf-8 -*- __author__ = 'author' class Solution(object): def search(self, nums, target): """ :type nums: List[int] :type target: int :rtype: int """ return self.sor…

Follow up for "Search in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 题意:查询给定目标值是否在数组中,是search in rotated sorted ar…

Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 思路:此题在解的时候,才发现Search in Rotated Sorted Array…

题目: 给定一个旋转数组,但是你不知道旋转位置,在旋转数组中找出给定target值出现的位置:你可以假设在数组中没有重复值出现 举例: (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). 在旋转后的数组中查找6,则返回index =2. 若查找10,则返回index= -1: 解题思路: 由于数组中没有重复出现的数字,因此旋转后的数组基本可以划分为两部分:因此解题思路可以转换为我们熟悉的二分查找:但是在二分查找时我们需要注意,到底在哪边查找? 1)…

这是 “搜索旋转排序数组”问题的跟进:如果数组元素允许重复,怎么办?这会影响到程序的时间复杂度吗?会有怎样的影响,为什么?假设按照升序排序的数组在预先未知的某个关键点上旋转.(例如, 0 1 2 4 5 6 7 可能变成 4 5 6 7 0 1 2).编写一个函数来判断给定的目标是否在数组中.该数组可能包含重复项.详见:https://leetcode.com/problems/search-in-rotated-sorted-array-ii/description/ Java实现: clas…

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 index, otherwise return -1.You…

题目链接:https://leetcode.com/problems/search-in-rotated-sorted-array-ii/#/description   姊妹篇:http://www.cnblogs.com/zpfbuaa/p/6531773.html   给出一个循环有序数组,与其姊妹篇不同的是其中允许元素出现重复多次.给定一个数字target,查找该数字是否存在于该数组中.   姊妹篇中的解决方法是使用折半查找,通过判断nums[left]和nums[mid]以及nums[r…

11.3 Given a sorted array of n integers that has been rotated an unknown number of times, write code to find an element in the array. You may assume that the array was originally sorted in increasing order. EXAMPLE Input: find 5 in {15, 16, 19, 20, 2…

LeetCode上牵扯到Rotated Sorted Array问题一共有四题,主要是求旋转数组的固定值或者最小值,都是考察二分查找的相关知识.在做二分查找有关的题目时,需要特别注重边界条件和跳出条件.在做题的过程中,不妨多设几个测试案例,自己判断一下. 下面是这四题的具体解答. 33.Search in Rotated Sorted Array 在求旋转数组中查找固定值,数组中每个数唯一出现.返回查找索引. class Solution: def search(self, nums: List…

Follow up for "Find Minimum in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might be…

题目: 恢复旋转排序数组 给定一个旋转排序数组,在原地恢复其排序. 样例 [4, 5, 1, 2, 3] -> [1, 2, 3, 4, 5] 挑战 使用O(1)的额外空间和O(n)时间复杂度 说明 什么是旋转数组? 比如,原始数组为[1,2,3,4], 则其旋转数组可以是[1,2,3,4], [2,3,4,1], [3,4,1,2], [4,1,2,3] 解题: 开始我想,先找到中间的临界点,然后在排序,临界点找到了,排序不知道怎么搞了,在这里,看到了很好的方法,前半部分逆序,后半部分逆序,整…

Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,0,1,2,2,5,6] might become [2,5,6,0,0,1,2]). You are given a target value to search. If found in the array return true, otherwise return false. Ex…

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]). Find the minimum element. The array may contain duplicates. Example 1: Input: [1,3,5] Output: 1 Exa…

Leetcode之二分法专题-154. 寻找旋转排序数组中的最小值 II(Find Minimum in Rotated Sorted Array II) 假设按照升序排序的数组在预先未知的某个点上进行了旋转. ( 例如,数组 [0,1,2,4,5,6,7] 可能变为 [4,5,6,7,0,1,2] ). 请找出其中最小的元素. 注意数组中可能存在重复的元素. 示例 1: 输入: [1,3,5] 输出: 1 示例 2: 输入: [2,2,2,0,1] 输出: 0 跟153题很像,只不过这题会有重…

Leetcode之二分法专题-153. 寻找旋转排序数组中的最小值(Find Minimum in Rotated Sorted Array) 假设按照升序排序的数组在预先未知的某个点上进行了旋转. ( 例如,数组 [0,1,2,4,5,6,7] 可能变为 [4,5,6,7,0,1,2] ). 请找出其中最小的元素. 你可以假设数组中不存在重复元素. 示例 1: 输入: [3,4,5,1,2] 输出: 1 示例 2: 输入: [4,5,6,7,0,1,2] 输出: 0 很明显,我们需要用二分查找…

题目描述: python实现 Search in Rotated Sorted Array 搜索旋转排序数组   中文:假设按照升序排序的数组在预先未知的某个点上进行了旋转. ( 例如,数组 [0,1,2,4,5,6,7] 可能变为 [4,5,6,7,0,1,2] ). 搜索一个给定的目标值,如果数组中存在这个目标值,则返回它的索引,否则返回 -1 . 你可以假设数组中不存在重复的元素. 你的算法时间复杂度必须是 O(log n) 级别. 英文:Suppose an array sorted i…

Search in Rotated Sorted Array Suppose a sorted array 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 index, otherwise retu…