Week focuses on the highest-frequency patterns:
Day : Hash Map ( problems). Work on frequency counting patterns.
Day : Two Pointers ( problems). Focus on sorted array techniques.
Day : Sliding Window ( problems). Practice variable and fixed windows.
Day : Prefix Sum ( problems). Build cumulative sum intuition.
Day : Stack ( problems). Focus on parentheses and monotonic patterns.
Day : Review. Redo any problems you couldn't solve without hints.
Day is rest. Don't skip it.