Rearrange Array Elements by Sign | DSA for Beginners | Hinglish Explanation

Описание: Welcome to NullPointer Academy! 🚀
Yeh hai hamari DSA Playlist ka Atharahva (Day 18) video. Aaj hum solve karenge Rearrange Array Elements by Sign problem (Leetcode 2149) — jisme hume array ke positive aur negative numbers ko alternate order mein arrange karna hota hai.

🔹 Problem Covered: Positive aur negative numbers ko alternate positions pe place karna (positive se start hote hue).

🔹 Language: Hinglish (Simple aur Easy to Understand)

📌 What you’ll learn in this video:

✔ Simple Index-Based Approach (O(n) Time, O(n) Space) –
Positive numbers ko even indices pe rakhna,
Negative numbers ko odd indices pe rakhna.

✔ Dry Run with Examples – Input arrays jaise [3,1,-2,-5,2,-4] aur [-1,1] ke saath step-by-step walkthrough.

✔ Full C++ Code Implementation – Line-by-line explanation of given approach.

✔ Time & Space Complexity Analysis – Kyun O(n) time aur O(n) extra space best straightforward solution hai.

✔ Intuition Behind the Solution – Kyun positive even pe aur negative odd pe rakhne se correct arrangement milta hai.

✔ Interview Insights – Common mistakes avoid karna, jaise galat index increment karna ya overwrite kar dena.

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