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. Example: Input: [1,2,1,3,2,5] Output: [3,5] Note: The order of the result is…

public class Solution { public int[] SingleNumber(int[] nums) { var dic = new Dictionary<int, int>(); foreach (var num in nums) { if (!dic.ContainsKey(num)) { dic.Add(num, ); } else { dic[num]++; } } var list = dic.OrderBy(x => x.Value).ToList();…

136. Single Number Given an array of integers, every element appears twice except for one. Find that single one. (Easy) Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 分析: 第一问属于技巧题,做过就会,…

分门别类刷算法,坚持,进步! 刷题路线参考: https://github.com/chefyuan/algorithm-base 大家好,我是刷题困难户老三,这一节我们来刷几道很有意思的求次数问题,它们都有同一类非常巧妙的解法. 这种解法是什么呢?往下看吧! 基础知识 在开始之前,我们最好先了解一些位运算的基础知识. 原反补码 先简单说一下,原码.反码.补码. 一个数在计算机中的二进制表示形式, 叫做这个数的机器数.机器数是带符号的,在计算机用一个数的最高位存放符号, 正数为0, 负数为1.…