Longest Consecutive Sequence | DSA for Beginners | Hinglish Explanation скачать в хорошем качестве

Longest Consecutive Sequence | DSA for Beginners | Hinglish Explanation

Welcome back to NullPointer Academy! 🚀 Yeh hai hamari DSA Playlist ka Ikkeesva (Day 21) video. Aaj hum solve karenge ek super important interview problem — Longest Consecutive Sequence 🔥 Ye problem coding interviews aur online assessment rounds mein kaafi frequently poochhi jaati hai. 🔹 Problem Covered: Array diya hota hai, hume longest length nikalni hoti hai jisme numbers consecutive ho (order matter nahi karta). 👉 Consecutive ka matlab: x, x+1, x+2, x+3 … 👉 Elements array mein kisi bhi order mein ho sakte hain. Example: Input: [100, 4, 200, 1, 3, 2] Output: 4 (Sequence: 1, 2, 3, 4) 🔹 Language: Hinglish (Simple, clear aur beginner-friendly) 📌 What you’ll learn in this video: ✔ Brute Force Approach – Har element ke liye check karna ki kya x+1, x+2, x+3 … array mein present hain ya nahi. ❌ Repeated checks ki wajah se approach slow ho jaati hai ❌ Large input size ke liye inefficient Time Complexity: O(N²) ✔ Better Approach (Sorting Based) – ✔ Pehle array ko sort karna ✔ Phir check karna ki next element exactly +1 hai ya nahi ✔ Duplicates ko properly handle karna Is approach se unnecessary checks kam ho jaate hain. Time Complexity: O(N log N) Space Complexity: O(1) ✔ Optimal Approach (Interview Favourite) 🔥 – ✔ Unordered Set / Hash Set ka use ✔ Sirf wahi element sequence start karega jiska previous number exist nahi karta ✔ Ek single pass mein sequence ki length calculate karna ✨ No sorting ✨ No repeated traversal ✨ Clean logic Time Complexity: O(N) Space Complexity: O(N) ✔ Dry Run with Examples – Step-by-step explanation ke saath arrays jaise: [100, 4, 200, 1, 3, 2] [0, 3, 7, 2, 5, 8, 4, 6, 0, 1] Har approach ka visual dry run + clear intuition 🔍 ✔ Pseudo Code Explanation – ✔ Language-independent pseudo code ✔ Logic pe focus — syntax pe nahi ✔ Viewers apni preferred language (C++, Java, Python, etc.) mein easily implement kar sakte hain ✔ Time & Space Complexity Analysis – Teenon approaches ka clear comparison Aur ye bhi discuss kiya gaya hai ki interview mein kaunsa approach best hai aur kyun ✔ Interview Insights – ✔ Common mistakes: Har element se sequence start kar dena Duplicates ignore na karna Optimal approach ka intuition miss karna ✔ Edge cases: Empty array Single element Duplicate values Already consecutive elements 👉 Subscribe for Daily Hinglish DSA Videos:    / @nullpointeracademy   💬 Agar video pasand aaye to LIKE 👍, SHARE aur SUBSCRIBE karein. Koi doubt ho to comments mein poochho — main help karne ke liye hoon 🚀