Repeating & missing element | Array - Hard | Strivers A-Z DSA

In this video, we solve the important and popular interview problem – “Find the Repeating and Missing Number”, where you're given an array containing n elements from 1 to n with one number repeated and one missing.

This problem sharpens your understanding of mathematics-based solutions, XOR techniques, and frequency hashing – all critical for competitive programming and interviews.
✅ Topics Covered:

Understanding the Problem Statement

Brute Force Using Frequency Array

Sum Formula Method (Mathematics-Based)

XOR-Based Optimal Solution

Time and Space Complexity Analysis

C++ and Java Code Explanation

Dry Run with Sample Input
📌 Problem Link:
LeetCode:
https://leetcode.com/problems/set-mismatch/
📚 Striver’s A-Z DSA Sheet:
https://takeuforward.org/interviews/strivers-sde-sheet-top-coding-interview-problems/

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Видео Repeating & missing element | Array - Hard | Strivers A-Z DSA канала Takla Coder