PHASE 04
👉 Two Pointers & Sliding Window
Walk two fingers along an array, or slide a window across it — and solve pair sums, palindromes, longest substrings and more in a single pass.
⏱️ ~1.5 hours of lessons
📚 2 lessons
✏️ 7 exercises Medium
▶ Start this phase
🎯 In this phase you will…
- Apply opposite-end two pointers
- Apply same-direction pointers
- Use fixed and variable sliding windows
📺 Lessons in this playlist
📝 Phase test
Concept questions, pseudocode writing, tracing and debugging — check you’re ready for the next phase.
💡 Concept check
What is the time complexity of the two-pointer pair search on a sorted array?
