2-Week Interview Blitz
The highest-yield problems when your interview is close.
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Must-Solve Patterns
One representative problem per pattern — if you can do these, you can adapt.
Two SumStart here
Product of Array Except Self
3Sum
Longest Substring Without Repeating Characters
Valid Parentheses
Search in Rotated Sorted Array
Reverse Linked List
Binary Tree Level Order Traversal
Lowest Common Ancestor of a Binary Tree
Number of Islands
Course Schedule
Coin Change
Merge Intervals
Binary Search
Classic binary-search primer — coming soon to the catalog.