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…

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…

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…

题目链接: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 extr…

要求:给定一个整数数组,除了其中1个元素之外,其他元素都会出现两次.找出这个只出现1次的元素. 例: array =[3,3,2,2,1]    找出元素1. 思路:最开始的想法是用两次for循环,拿数组自身和自身进行匹配查找,如果能匹配到相同的元素,则进行匹配下一个元素. 后来发现运用 ^异或 操作非常简单明了. 两个相应位上比特如果相异,则执行 异或 操作会得到1 比如二进制:  101 ^ 101 得 000 101 ^ 010 得 111 用此方法对数组元素遍历异或, 得出来得结果 就是…

今天做了三道LeetCode上的简单题目,每道题都是用c++和Python两种语言写的.由于c++版的代码网上比較多.所以就仅仅分享一下Python的代码吧,刚学完Python的基本的语法,做做LeetCode的题目还是不错的,对以后找工作面试也有帮助! 刚開始就从AC率最高的入手吧! 1.Given an array of integers, every element appears twice except for one. Find that single one. Note: Your…

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?…

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:…

原题链接:Largest Number 题目描述: Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be very large, so you need to retur…