Single Number II
Explore how to identify the two unique numbers in an array where all other elements appear twice, using efficient bitwise manipulation techniques. This lesson helps you implement a solution that operates with constant extra space, deepening your understanding of bitwise operations for coding interviews.
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Statement
Given a non-empty array arr, in which exactly two elements appear once, and all the other elements appear twice, return the two elements that appeared only once.
Note: The result can be returned in any order. The solution should use only constant extra space.
Constraints:
arr.lengtharr[i]
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
Two Single Numbers
(Select all that apply.) What is the output if the following array is given as an input?
arr = [1, 6, 2, 1, 2, 4, 7, 4] Multi-select
[6, 2]
[6, 7]
[7, 6]
[1, 2, 4]
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground:
#include <iostream>#include <vector>vector<int> TwoSingleNumbers(vector<int> arr){// Replace this placeholder return statement with your codereturn {};}