LeetCode Single Number Explained | Optimal Solution | Easy Interview Problem
Автор: Info Techiezz
Загружено: 2026-01-02
Просмотров: 75
Leetcode Link : https://leetcode.com/problems/single-number/
In this video, we solve the LeetCode Single Number problem using the most optimal XOR approach in C++.
🔹 Problem Statement
Given a non-empty array of integers where every element appears twice except one, find the element that appears only once.
🔹 Approach Used: XOR (Bit Manipulation)
We use the XOR (^) operator, which has powerful properties:
a ^ a = 0 (duplicates cancel out)
a ^ 0 = a
XOR is commutative and associative
By XORing all elements in the array, all duplicate numbers cancel each other, and the remaining value is the single number.
🔹 Example
Input: {2, 2, 1}
Output: 1
🔹 Algorithm Steps
Initialize a variable with 0
Traverse the array
XOR each element with the variable
Return the final value
🔹 Complexity Analysis
⏱ Time Complexity: O(n)
🧠 Space Complexity: O(1)
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