Pattern Recognition Drill

Pattern Recognition Drill

Now that you've reviewed complexity in Big O Notation Cheat Sheet and operations in An Executable Data Structures Cheat Sheet for Interviews, the next step is choosing the right tool quickly.

Interviewers rarely say: "Please use a hash table." They say things like:

• "Find duplicates."
• "Return the shortest path."
• "The input is sorted."
• "Find the longest contiguous subarray."
• "Optimize this from quadratic time."

This lesson is a drill in mapping prompt signals to candidate patterns.

Prompt words → required operation → data structure/pattern → complexity story

The goal is not to memorize one trick per problem. The goal is to build a fast first-pass instinct, then verify it with constraints and tradeoffs.