Given a 2D integer array matrix, return the transpose of matrix. The transpose of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices.
// এবং শুধু square matrix-এর ক্ষেত্রে matrix[i][j] ও matrix[j][i] swap করে in-place transpose করা সম্ভব। // In-place Transpose (শুধু Square Matrix-এর জন্য) // যদি 3×3, 4×4 ...
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