[LeetCode136]Single Number

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題目:

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?

中文(給定一個整數的數組,每個整數都出現了兩次,只有一個出現了一次,找到它  建議不使用額外的記憶體空間)

思路:利用^運算子  

二元 ^ 運算子是為整型和 bool 類型預定義的。對於整型,^ 將計算運算元的按位“異或”。對於 bool 運算元,^ 將計算運算元的邏輯“異或”;也就是說,若且唯若只有一個運算元為 true 時,結果才為 true。

代碼:

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace LeetCode{    class SingleNumberSolution    {        //static void Main()        //{        //    SingleNumberSolution s = new SingleNumberSolution();        //    int[] nums = {1, 1, 2, 3, 3, 4, 4};        //    Console.WriteLine(s.SingleNumber(nums));        //}        public int SingleNumber(int[] nums)        {            int singleNum = nums[0];            for (int i = 1; i < nums.Length; i++)            {                singleNum ^= nums[i];            }            return singleNum;        }    }}

 

[LeetCode136]Single Number

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