Matrix / Grid

Grid problems treat a 2-D matrix as a graph of cells and apply traversal, search, or DP across the rows and columns. Watch for boundary checks, in-place marking to save space, and the four- versus eight-direction neighbor choice.

8 LeetCode problems solved with the Matrix / Grid pattern. Practice them with spaced repetition so the pattern sticks.

• Game of LifeMEDIUM · O(m * n)
• Island PerimeterEASY · O(m*n)
• Rotate ImageMEDIUM · O(n^2)
• Search a 2D Matrix IIMEDIUM · O(m + n)
• Set Matrix ZeroesMEDIUM · O(m*n)
• Spiral MatrixMEDIUM · O(m*n)
• Spiral Matrix IIMEDIUM · O(n^2)
• Transpose MatrixEASY · O(m*n)