Two Pointer #dsa #enur #internship #csmajor #leetcode

Two pointers — one of the simplest tricks that can turn an O(n²) solution into O(n) ⚡
Instead of checking every pair with nested loops, you place two index variables strategically and move them based on a condition. Less work. Same result.
Two main patterns:
👉 Opposite ends → meet in the middle (Two Sum, Valid Palindrome)
👉 Fast & Slow → same direction (Remove Duplicates, Cycle Detection)
Master this and a whole category of array & string problems becomes way easier 🧠
Save this for your next coding session 🔖
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