题目要求 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? 一个int数组中,除了有一个int只出现了一次,其他int都出现了两次,请找出…

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? Hide Tags Bit Manipulation   数组中的数均出现3…

题目描述: 给定一个包含n个整数的数组,除了一个数出现一次外所有的整数均出现三次,找出这个只出现一次的整数. 题目来源: http://oj.leetcode.com/problems/single-number-ii/ 题目分析: 对于除出现一次之外的所有的整数,其二进制表示中每一位1出现的次数是3的整数倍,将所有这些1清零,剩下的就是最终的数. 用ones记录到当前计算的变量为止,二进制1出现“1次”(mod 3 之后的 1)的数位.用twos记录到当前计算的变量为止,二进制1出现“2次”(…

1.数组中仅仅有一个元素仅仅出现一次,其余出现偶数次. 利用异或中同样元素相互抵消的方式求解. 2.数组中仅仅有2个元素仅仅出现一次.其余出现偶数次. class Solution { public: int singleNumber(int A[], int n) {//返回仅仅出现一次的元素 if(n==1)return A[0]; int i,sum=A[0]; for(i=1;i<n;++i)sum^=A[i]; return sum; } vector<int> twoSing…

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 an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example,Given nums = [0, 1, 3] return 2. Note:Your algorithm should run in linear runtime complexity. Could you implement it usi…

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? 本来是一道非常简单的题,但是由于加上了时间复杂度必须是O(n),并且空间复杂度为O(1)…

原题链接在这里:https://leetcode.com/problems/single-number-iii/ 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 appear only once. For example: Giv…

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…

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? 这道题是之前那道 Single Number 单独的数字的延伸,那道题的解法…