leecode single numer

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http://www.acmerblog.com/leetcode-single-number-ii-5394.html acm之家的讲解总是那么到位 public class Solution { public int singleNumber(int[] A) { int ans=0; //0^X=X x^X=x for(int i=0;i<A.length;i++) { ans=ans^A[i]; } return ans; } } sing number (2) 高端方法太难了,不想看了…

LeeCode（No2 - Add Two Numbers）

LeeCode是一个有意思的编程网站,主要考察程序员的算法第二题: You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked l…

linux-关机出现Telling INIT to go to single user mode.无法关机

运行/sbin/shutdown now最后显示:Telling INIT to go to single user mode.INIT:Going single userINIT:Sending grocesses the TERM signalINIT:no more processes left in this runlevelsh-3.2#在此状态下运行csh后自动登录为root.若运行exit系统就重新启动回到登录画面. 登录后运行reboot,系统可正常重启. 解决方法: 1.…

[LeetCode] Single Number III 单独的数字之三

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…

[LeetCode] Single Number II 单独的数字之二

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…

[LeetCode] Single Number 单独的数字

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)…

leecode系列--Two Sum

学习这件事在任何时间都不能停下.准备坚持刷leecode来提高自己,也会把自己的解答过程记录下来,希望能进步. Two Sum Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution. Example: Given n…