Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 没辙,智商碾压题.楼主没遇到之前就只会这种做法. public int si…

question: Given an array of integers, every element appears twice except for one. Find that single one. my first answer(which is wrong, due to Time Limit Exceeded) the correct answer: 我的思路:一开始想到了转成Serise ,再用value_count, 但是显示没有pandas 包, 所以想到了生成一个字典然后计…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find >the two elements that a…

[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…

Problem link: http://oj.leetcode.com/problems/single-number-ii/ The problem seems like the Single Number. Suppose we have following (3m+1) numbers in the array A: x0, x1, x1, x1, ..., xm, xm, xm We are asked to find out the value of x0. However we ca…

Prolbem link: http://oj.leetcode.com/problems/single-number/ This prolbem can be solved by using XOR(exclusive OR) operation. Let x, y, and z be any numbers, and XOR has following properties: x XOR 0 is itself, i.e. x XOR 0 = 0; x XOR x is 0, i.e. x…

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…

The question: Single Number 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? My analysis: Thi…

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…

Single Number 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? 解法一:用map记录每个元素的次数,返回次数为1的元素 cl…

描述: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? 题目要求O(n)时间复杂度,O(1)空间复杂度. 思路1:初步使用暴力搜索,遍历…

Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 题解:线性时间,O(1)的空间复杂度,只能把整数写成二进制的形式运算了.具体…

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? 看了别人的解答才会的,利用公式a XOR b XOR a = b,从A[n]开始…

https://leetcode.com/problems/single-number/ 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?…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 Given an array of integers, every element appears three times except for one. Find that single one. Note: Your algorithm should have a linear runtime complex…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)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. C…

题目: Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 题解: The code seems tricky and hard…

-------------------------------------- 一个数异或它自己会得到0,0异或n会得到n,所以可以用异或来消除重复项. AC代码如下: public class Solution { public int singleNumber(int[] nums) { int res=0; for(Integer i:nums) res^=i; return res; } } 题目来源: https://leetcode.com/problems/single-number…

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.…

这是悦乐书的第175次更新,第177篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第34题(顺位题号是136).给定一个非空的整数数组,除了一个元素外,每个元素都会出现两次. 找到那个只出现了一次的元素.例如: 输入:[2,2,1] 输出:1 输入:[4,1,2,1,2] 输出:4 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Java语言编写和测试. 02 第一种解法 因为已经限定传入的数组不为空,所以此题不需要…

Given a non-empty 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? Example 1: Input: [2,2,1] Output:…

一. 题目描写叙述 Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 1, 2, 3, 4, 5, 6, 8, 9, 10, 12 is the sequence of the first 10 ugly numbers. Note that 1 is typically tre…

问题描述: https://leetcode.com/problems/single-number-iii/ 在一个数组里面,只有两个元素仅出现过1次,其余都出现过两次.找出出现仅一次的那两个(a, b). 要求常量空间,线性时间. 问题解决: 这题用到“神奇的位运算”. 1.因为除了特殊的两个元素,其余两两出现,那么就想到了XOR(异或). 2.从头到尾XOR之后,会得到a xor b 的结果.接下来我们试着把这两个元素分离开来. 3.我们在a xor b 中找到任意一位XOR[diff_po…

1. 题目 1.1 英文题目 Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution with a linear runtime complexity and use only constant extra space. 1.2 中文题目 给定一个非空整数数组,除了某个元素只出现…

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 题目地址:https://leetcode.com/problems/single-number-iii/description/ 题目描述 Given an array of numbers nums, in which exactly two elements appear only once and all the other…

Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements that appear only once. For example: Given nums = [1, 2, 1, 3, 2, 5], return [3, 5]. Note: The order…

1.题目描述 2.分析 3.代码 int singleNumber(vector<int>& nums) { map<int,int> m; for( vector<int>::iterator p = nums.begin() ; p != nums.end() ; ++p ) { m[*p]++; } ; i < nums.size() ; i++ ) { ) return nums[i]; } }…

问题描述:给出一个整数数组,除了一个元素外,其他每个元素都出现了2次,找出只出现1次的元素. int singleNumber(vector<int>& nums); 分析:比较自然的想法是用一个容器来进行插入.查找.删除操作.遍历nums,先查找容器中是否包含该元素,是则插入,否则删除.最后容器中只剩下只出现1次的元素. 解法: int singleNumber(vector<int>& nums) { int i = 0; unordered_set<in…

题目描述(面试常考题) 借助了异或的思想 class Solution { public: int singleNumber(vector<int>& nums) { ; ; i < nums.size() ; i++) ret = ret ^ nums[i]; return ret; /* 出现3次的情况借助了位运算的思想,相同的数 则 在int型的各32位都相等,所以32位中各位求和取余就可以得到结果 */ class Solution { public: int singl…

题目描述: 给定一个非空整数数组,除了某个元素只出现一次以外,其余每个元素均出现两次.找出那个只出现了一次的元素. 要求:  时间复杂度O(n),空间复杂都O(1) 示例: 输入: [2,2,1] 输出: 1 输入: [4,1,2,1,2] 输出: 4 解决方案: 方法一:异或 class Solution{ public: int singleNumber(vector<int>& nums){ int x = 0; for (auto i : nums){ x ^= i; } re…