Leetcode 137 Single Number II

Source: Internet
Author: User

Given an array of integers, every element appears three times except for one. Find the single one.

Your algorithm should has a linear runtime complexity. Could you implement it without using extra memory?

Method One: Principle with Leetcode 136 single number

varSinglenumber =function(nums) {varhash = {}     for(vari=0; i<nums.length; i++)        if(!Hash.hasownproperty (Nums[i]) hash[nums[i]= 1ElseHash[nums[i]]+ = 1 for(varXinchhash)if(Hash[x] < 2)            returnNumber (x)}

Method Two: Bit manipulation

Leetcode 137 Single Number II

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