mediumBlind 75
Rotate Image
Rotate n x n matrix 90 degrees clockwise in-place Input: 2D square matrix Output: rotated matrix (modify in-place and return)
At its core, Rotate Image rewards a simple data-structure choice over clever math. Interviewers love it because it reveals your data-structure instincts and your edge-case discipline. The signal here is clean bookkeeping: know what you record and when you update it.
Arrays & HashingMath & Geometry
Meet Coco
Coco is an AI study partner, not a person. She listens while you explain your code, asks what a line does and never hands you the fix. Typing with Coco is free when you sign in, up to a daily limit. Talking with her out loud comes with the $79 pack. Anyone can open the editor and run their code.
1Matrix Rotationmedium
Based onLeetCode