Computer Science · Oct / Nov 2025 · Paper 1 HL · Question 15
Adapt for 2027Processing a 2D array with nested loops is B2.2.2 and B2.3, but the algorithms must be written in Python or Java instead of pseudocode.
IBCS
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15. A two-dimensional array is also known as a matrix. A square matrix is a matrix with the same number of rows and columns. Figure 1: Example data stored in four square matrices: AMAT, BMAT, CMAT, and DMAT AMAT BMAT [0] [1] [2] [3] [4] [0] [1] [2] [3] [0] 2 4 1 4 5 [0] 1 0 0 0 [1] 0 5 7 0 6 [1] 3 6 0 0 [2] 0 0 3 2 2 [2] 4 0 7 0 [3] 0 0 0 2 3 [3] 0 3 2 0 [4] 0 0 0 0 9 CMAT DMAT [0] [1] [2] [0] [1] [2] [3] [0] 2 0 0 [0] 1 5 0 0 [1] 0 5 0 [1] 3 6 9 0 [2] 0 0 3 [2] 4 0 7 1 [3] 0 3 2 0 The main diagonal is the set of elements that run from the upper left-hand corner of the matrix to the lower right-hand corner of the matrix.
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15(a)[1]
15(b)[2]
15(c)[7]
15(d)[5]
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