Yeh Trick Seekh Lo - Array Problem Half Ho Jaayenge | Two Pointers | Ep 03

Ek pointer se kaam nahi chala? Toh do lagao. 🔥 Two Pointers — yeh woh technique hai jo array problems ko O(n²) se seedha O(n) mein le aati hai. Aur ek baar yeh pattern samajh gaya — bahut saare LeetCode questions khud solve hone lagte hain. Is video mein maine Two Pointers ka poora pattern explain kiya hai — kab use karein, kyun use karein, aur kaise sochein — visualization aur notebook ke saath, C++ mein, Hinglish mein. Aur saath mein? 3 actual LeetCode questions jo yeh pattern perfectly demonstrate karte hain. Ek easy warm-up, ek string pe application, aur ek medium jisme sort + two pointers ka combo lagta hai. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🧠 IS VIDEO MEIN KYA SEEKHEGA: → Two Pointers pattern kya hai aur kab use karna hai → Left-Right pointers vs Same direction pointers → Sorted array pe two pointers kyun kaam karta hai → String pe two pointers kaise apply hota hai → 3 LeetCode questions — brute force se optimal tak ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 📌 IS VIDEO KE 3 LEETCODE QUESTIONS: 🟢 LC #167 — Two Sum II (Input Array Is Sorted) [Easy] → Sorted array mein do numbers dhundho jo target sum dein. → Left pointer start pe, right end pe — converge karo. → O(n) time, O(1) space — two pointers ka seedha application. 🟢 LC #125 — Valid Palindrome [Easy] → String palindrome hai ya nahi — two pointers se check karo. → Alphanumeric characters ignore karo, dono ends se check karo. → String problems mein two pointers ka pehla use case. 🟡 LC #15 — 3Sum [Medium] → Teen numbers dhundho jo sum zero den — no duplicates. → Sort karo, ek fix karo, baaki do ke liye two pointers. → Yeh ek question hi Two Sum + Two Pointers dono ka combo hai. → FAANG mein sabse zyada poochhe jaane wale questions mein se ek. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💡 ISKO DEKH KAB: ✅ Tu EP 01 aur EP 02 dekh chuka hai ✅ Arrays aur loops ka solid base hai ✅ LeetCode pe medium questions shuru karne hai ✅ Two pointers pattern interviews mein confidently use karna hai ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ⚡ NEXT VIDEO MEIN: LC #167 ka bhai — Two Sum II ka extended version aur Container With Most Water (LC #11) — Two Pointers Part 2. Subscribe karo toh miss mat hoga. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔥 SERIES KE BAARE MEIN: Automate IQ ka 300 LeetCode Challenge — C++ mein, zero se, placement-ready tak. Har video mein ek DSA pattern + LeetCode questions — visualization first, code baad mein, Hinglish mein. Playlist order: → EP 01: C++ Basics to Loops → EP 02: Arrays & Prefix Sum → EP 03: Two Pointers (YEH VIDEO) → EP 04: Two Pointers Part 2 + More Questions ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💬 EK KAAM KAR: Comment mein likh — "Day 3 ✅" Aur bata — LC #15 (3Sum) tune khud try kiya ya seedha solution dekha? Honestly batana — koi judgment nahi. 😄 Main har comment personally padhta hoon. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔗 USEFUL LINKS: LeetCode #167 → https://leetcode.com/problems/two-sum... LeetCode #125 → https://leetcode.com/problems/valid-p... LeetCode #15 → https://leetcode.com/problems/3sum/ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔔 Subscribe + Bell icon — EP 04 aa raha hai. Automate IQ | AI Automation | Coding for Everyone #twopointers #leetcode #cpp #dsa #arrays #cplusplus #coding #competitiveprogramming #placements #automateiq