Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element that appears only once. Example 1: Input: [1,1,2,3,3,4,4,8,8] Output: 2 Example 2: Input: [3,3,7,7,…

题目:Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element that appears only once. 大意:给定一个已排序.全是整数int.每个元素出现两次(除了单独出现一次的元素)的数组,找到这个单独的元素. 例1: Input: [,,,,,…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 解题方法 方法一:异或 方法二:判断相邻元素是否相等 方法三:二分查找 日期 题目地址:https://leetcode.com/problems/single-element-in-a-sorted-array/description/ 题目描述 Given a sorted array consisting of only integers where every…

题目如下: 解题思路:题目要求时间复杂度是O(logN),可以尝试使用二分查找法.首先数组是有序的,而且仅有一个元素出现一次,其余均为两次.我们可以先找到数组最中间的元素,记为mid.如果mid和mid-1以及mid+1都不相同,那么mid就是single number.如果mid和mid-1相同,就要分两种情况,a.mid是奇数,single number会出现在mid的右半边:b.mid是偶数,出现在左半边.同理,如果mid和mid+1相同,那么是相反的:a.mid是奇数,出现在左半边:b.…

给定一个只包含整数的有序数组,每个元素都会出现两次,唯有一个数只会出现一次,找出这个数.示例 1:输入: [1,1,2,3,3,4,4,8,8]输出: 2 示例 2:输入: [3,3,7,7,10,11,11]输出: 10注意: 您的方案应该在 O(log n)时间复杂度和 O(1)空间复杂度中运行.详见:https://leetcode.com/problems/single-element-in-a-sorted-array/description/ C++: 方法一: class Solu…

题目大意: 给你一个由小到大排好序的数组,里面只有一个数出现了一次,其他数都出现了两次,要求找出那个只出现一次的数,而且时间复杂度为O(logn) 题目思路: 说实话一开始没想到,因为几乎每个数都出现了两次那么对于一个偶数i,一定有nums[i] == nums[i+1]否则说明在这之前出现过只出现一次的数字.这样就是可以用二分查找,其实当读到题目说logn的复杂度时想都不用想是二分了 class Solution: def singleNonDuplicate(self, nums): "&q…

540. 有序数组中的单一元素 540. Single Element in a Sorted Array 题目描述 每日一算法2019/6/14Day 42LeetCode540. Single Element in a Sorted Array…

Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element that appears only once. Example 1: Input: [1,1,2,3,3,4,4,8,8] Output: 2 Example 2: Input: [3,3,7,7,…

Question Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element that appears only once. Example 1: Input: [1,1,2,3,3,4,4,8,8] Output: 2 Example 2: Input:…

Given a sorted array consisting of only integers where every element appears twice except for one element which appears once. Find this single element that appears only once. Example 1: Input: [1,1,2,3,3,4,4,8,8] Output: 2  Example 2: Input: [3,3,7,7…