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Both loops can be vectorized!DO J = 1, N A(J,J) = X(J)*3 DO I = 1, N B(I,J) = A(I,J)*C(I,J) ENDDO ENDDODO J = 1, N A(J,J) = X(J)*3 ENDDO DO J = 1, N DO I = 1, N B(I,J) = A(I,J)*C(I,J) ENDDO ENDDO