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.…

[LeetCode]153. Find Minimum in Rotated Sorted Array 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/description/ 题目描述: Suppose an array sorted in ascending order is rotated at some pivot unknown to yo…

[LeetCode]154. Find Minimum in Rotated Sorted Array II 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/description/ 题目描述: Follow up for "Find Minimum in Rotated Sorted Array": What if duplicat…

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 题目大意 解题方法 字典 日期 题目地址:https://leetcode.com/problems/n-repeated-element-in-size-2n-array/ 题目描述 In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is…

Find Minimum in Rotated Sorted Array II 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…

Find Minimum 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). Find the minimum element. You may assume no duplicate exists in the array. 与Search in Ro…

题目如下: In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times. Return the element repeated N times. Example 1: Input: [1,2,3,3] Output: 3 Example 2: Input: [2,1,2,5,3,2] Output: 2 Example 3: Input…

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…

Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums = [0,1,2,4,5,6,7] might become: [4,5,6,7,0,1,2] if it was rotated 4 times. [0,1,2,4,5,6,7] if it was rotated 7 times. Notice that rot…

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…

[LeetCode]137. Single Number II 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/single-number-ii/description/ 题目描述: Given an array of integers, every element appears three times except for one, which appears exactly once. Find that singl…

题目如下: We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, we delete all the characters in those indices. For example, if we have an array A = ["abcdef&quo…

Single Number II Given an array of integers, every element appears threetimes except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 解法一:开辟map记录次数 class So…

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. For example,Given [3,2,1,5,6,4] and k = 2, return 5. 思路: 堆.讲解:二叉堆 class Solution { public: //新插入i结点 其父节点为(i…

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:…

problem 961. N-Repeated Element in Size 2N Array solution: class Solution { public: int repeatedNTimes(vector<int>& A) { unordered_map<int, int> amap; for(auto a:A) { amap[a]++; } , max_val; for(auto a:amap) { if(a.second>max_num) { max…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/max-chunks-to-make-sorted-ii/description/ 题目描述: This question is the same as "Max Chunks to Make Sorted" except the integers of the given array are not n…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 日期 题目地址:https://leetcode.com/problems/max-chunks-to-make-sorted/description/ 题目描述 Given an array arr that is a permutation of [0, 1, ..., arr.length - 1], we split the array in…

Find Minimum in Rotated Sorted Array II 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. E…

Find Minimum in Rotated Sorted Array 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…

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…

题目地址: https://oj.leetcode.com/problems/find-minimum-in-rotated-sorted-array-ii/ 题目内容: 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). Find the minimum element. The array may…

题目: 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). Find the minimum element. You may assume no duplicate exists in the array. 题解: class Solution { public: /** * @param nums…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 异或 字典 日期 [LeetCode] 题目地址:https://leetcode.com/problems/single-number/ Total Accepted: 183838 Total Submissions: 348610 Difficulty: Easy 题目描述 Given a non-empty array of integers…

题目: Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 提示: 此题的主要是利用异或运算(xor)的特性:不同的输出1,相同的输出0.…