Sanitize + Reverse Copy Pattern Visualizers

The Sanitize + Reverse Copy pattern is a recurring algorithmic shape that appears across coding interviews and competitive problems. Use it when the problem geometry matches its trigger conditions — recognizing the pattern collapses what looks like a hard problem into a familiar template. These visualizers trace Sanitize + Reverse Copy step-by-step on classics such as Valid Palindrome - Approach 1 - Extra Space, so you can internalize the moves before you ever need them under pressure.