Matrix

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Matrix Basics

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Diagonal Matrix (Square, only diagonal non-zero), Main Diagonal → (i, i), Reverse Diagonal → (i, n - 1 - i) Easy

Solution

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Scalar Matrix (Diagonal + equal values) Easy

Solution

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Transpose of a Matrix (i, j → j, i), Square Matrix → In-place, NxM Matrix → Create MxN matrix Easy

Solution

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Matrix Multiplication Medium

Solution

Spiral & Diagonal Traversals

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Print Matrix in Spiral Order Easy

Solution

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Find k-th Element in Spiral Order Medium

Solution

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Generate NxN Spiral Matrix (1 → N²) Medium

Solution

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Spiral Traversal from Any Cell (MxN) Hard

Solution

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Print ZigZag Diagonally from (0,0) Medium

Solution

Binary Matrix Problems

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Check Matrix has Corner 1’s Medium

Solution

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Find k such that kth row = 0s & kth column = 1s Medium

Solution

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Largest Boundary Square of X Hard

Solution

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Largest Plus Sign of 1’s Medium

Solution

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Maximum Rectangle with 1’s Hard

Solution

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Maximum Square with 1’s Medium

Solution

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Count All Square Submatrices with 1’s Medium

Solution

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0’s Coverage Problem (Up, Down, Left, Right) Medium

Solution

Advanced Matrix Problems

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Max Sum Submatrix - Rectangle Hard

Solution

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Max Sum Submatrix - Square of size K Hard

Solution

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Max Rectangle Sum ≤ K Hard

Solution

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Count Submatrices with Sum Divisible by K Hard

Solution

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Range Sum Queries (2D Prefix Sum) Medium

Solution

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Median of Row & Column Wise Sorted Matrix Hard

Solution

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Min Path Sum (TopLeft → BottomRight) Easy

Solution

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Unique Paths in Grid Easy

Solution