GFG POTD (25 Nov 2025) | Game of XOR | Easy Explanation + C++ Solution

Описание: GFG POTD: Game of XOR | GeeksforGeeks Problem of the Day.
In this video, we solve the Game of XOR problem with full explanation.
C++ Solution + Approach + Intuition explained step-by-step.

Problem
Given an array arr[], we need to compute the bitwise XOR of the values of all possible subarrays.
A subarray value is defined as XOR of all its elements.

This is an interesting problem involving:
• XOR properties
• How many times each element contributes to the final XOR
• Even-Odd frequency behavior of XOR

Key Idea
If an element at index i appears in an odd number of subarrays, it contributes to the final XOR.
If it appears in an even number of subarrays, it gets cancelled out.

So, only elements that appear odd number of times in subarrays will be included in the final XOR result.

What you will learn
• XOR behavior
• Contribution technique
• Odd/Even subarray counts
• Efficient O(n) solution

Language Used
C++ Solution + Intuition + Efficient Approach

Tags
GFG POTD | GeeksforGeeks Problem of the Day | Game of XOR | Coding Interview | DSA | C++ | Competitive Programming

#gfg #gfglive #geeksforgeeks #gfgpotd #gameofxor #dsa #coding #cpp