# Single Number

Category

Bit Manipulation

Checkbox

Checkbox

Difficulty

Easy

Index

68

Key Ideas

The key idea to solve this problem is to use bitwise XOR operation to find the single number in the given array.

Problem Number

136

Problem Summary

The problem number 136 in the LeetCode-75 curated list is called "Single Number." In this problem, you are given an array of integers where every element appears twice except for one. The task is to find the single element that appears only once. A key pitfall to watch out for is to avoid using extra memory or sorting the array.

Solution Summary

The best solution to solve the "Single Number" problem is to use the XOR operation. By XORing all the numbers in the given array, the duplicate numbers will cancel each other out, resulting in the single number. By iterating through the array and performing XOR on each number, the final result will be the single number. This solution has a time complexity of O(n) since it requires iterating through the entire array. Additionally, it does not require any extra space, making it an efficient solution for finding the single number in an array.

Tags

Array

Bit Manipulation