These are the MOST important patterns!

Key Takeaways

I'm going to show you how to pass technical interviews without the endless grind. Now, let me break down the most important patterns that you need to master. These cover probably 80% of what you'll see in technical interviews. So, first, two pointers. This is where you use two indices to traverse an array or a linked list, usually from opposite ends or at least at different speeds. It's great for problems involving pairs, sorted arrays, or linked list cycles. Second, sliding window. Create a dynamic window that moves across a sequence, expanding or shrinking based on certain conditions. Fast and slow pointers. So, two pointers moving speeds, typically used to detect cycles in linked lists or find the middle element. Fourth, binary search variations. Not just basic binary search, but modified versions for rotated arrays, finding boundaries, or searching in infinite sequences. Fifth, depth-first search and breadth-first search. These are essential for tree and graph problems. DFS goes deep before exploring the siblings, whereas BFS explores level by level. Sixth, dynamic programming. So, breaking problems into overlapping subproblems and storing solutions to avoid redundant work. Seventh, backtrack. So, exploring all possible solutions by building candidates incrementally and abandoning paths that don't work.