XOR Operation Intuition

0 votes

Except for one, every element in an array of numbers appears twice. 

Locate that solitary one.

Keep in mind that your algorithm should have a linear runtime complexity. 

Could you do that without using any more memory?

class Solution {
public:
    int singleNumber(vector<int>& nums) {
        int result = 0;
        for(auto & c : nums) {
            result ^= c;
        }
        return result;
    }
};

First of all, what sorts of keywords should I be paying attention to in order to figure out that I should be using an XOR operation for this question?

Also, why does XOR'ing all items in the vector with each other give us the one that is not repeated?

Jul 22, 2022 in C++ by Nicholas
• 7,760 points
231 views

No answer to this question. Be the first to respond.

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.

Related Questions In C++

0 votes
1 answer

Why would anyone use set instead of unordered_set?

Unordered sets must compensate for their O(1) ...READ MORE

answered Jun 1, 2022 in C++ by Damon
• 4,960 points
2,317 views
0 votes
1 answer

What is the difference between std::__gcd and std::gcd?

I done some research about this. The ...READ MORE

answered Jun 10, 2022 in C++ by Damon
• 4,960 points
1,348 views
0 votes
1 answer

Lower and Upper Bound in case of Decreasing/Non-ascending vector

Both std::lower bound and std::upper bound must have an increasing (non-decreasing) order as their objective. By giving a comparator as the 4th parameter of the functions, you may modify the meaning of "growing." To work with descending vectors, use std::greater. #include<iostream> #include<vector> #include<algorithm> #include<functional> using namespace std; int main() { ...READ MORE

answered Jun 14, 2022 in C++ by Damon
• 4,960 points
715 views
0 votes
1 answer

How do i apply lower_bound to a range of unsorted vector elements?

What's the point of sorting your array? ...READ MORE

answered Jun 15, 2022 in C++ by Damon
• 4,960 points
1,333 views
0 votes
1 answer

30 min Wait on a page and then perform any Operation using Selenium Webdriver

Implicit wait tells webdriver to poll the ...READ MORE

answered Apr 19, 2018 in Selenium by Shubham
• 13,490 points
2,627 views
0 votes
1 answer

How do you get the logical xor of two variables in Python?

If you're already normalizing the inputs to ...READ MORE

answered May 29, 2018 in Python by aryya
• 7,450 points
10,467 views
0 votes
2 answers

Performing HTTP POST operation in JAVA

I'm using JSON-Java to build my JSON object: JSONObject json ...READ MORE

answered Nov 26, 2018 in Java by Sushmita
• 6,910 points
4,255 views
0 votes
3 answers

Can anyone explain fold() operation in Spark?

Fold in spark Fold is a very powerful ...READ MORE

answered Aug 23, 2018 in Apache Spark by samarth295
• 2,220 points
11,962 views
0 votes
1 answer

Unable to perform an operation in Ethereum private network

It seems that the Unix socket can't ...READ MORE

answered Jul 31, 2018 in Blockchain by Shashank
• 10,400 points
900 views
0 votes
1 answer

Operation to simulate a Hadoop Production Cluster

In this case, what you can do ...READ MORE

answered Aug 9, 2018 in Big Data Hadoop by nitinrawat895
• 11,380 points
634 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP