Meta gives you problems in minutes, so speed matters. Solve these from [[u:/roadmaps/pattern-22|Pattern ]] on LeetCode.
- Two Sum
- Valid Parentheses
- Merge Intervals
- Longest Substring Without Repeating Characters
- Subarray Sum Equals K
- Product of Array Except Self
Walkthroughs are linked for each. If any give you trouble, review them before continuing.