Answer to Question #160687 in C++ for Nishant

Question

Suppose we have a 5 x 5 image.The pixels in the top row are numbered 0 through 4 left to right,the ones in the second row from the to are numbered 5 through 9 left to right, and so on. Suppose there is a 'T' in the middle. The horizontal bar is in the middle of the second row, and 3 pixels wide. The vertical bar is in the middle of the third column and is also 3 pixels wide. Only pixels of the 'T' are black, rest are white.

1 point

Suppose we flatten the image into an array(let's call it A, and it is indexed from 0) such that pixel number i goes into the array at index i. What is the index of a pixel in column a and row b? (Note that first row has a=0 and first column has b=0)

5 * j + i

5 * j * i

5 * i + j

5 * i + 5 * j

1 point

Which of the indices in the array correspond to black pixels ?

3

8

11

13

What is the total number of white pixels?

1 point

1 point

For the pixel at index i in the array, what are the corresponding row and column number (first row has row number 0, and second row has 1)?

Note: floor(x) is the largest integer that is less than or equal to x. ceil(x) is the smallest

integer that is greater than or equal to x.

floor(i/5), i%5

i%5, floor(i/5)

ceil(i/5), i%5

floor(i/5)+1, i%5

Answer 1

Q1. 5 * i + j

Q2. 8

Q3. 20

Q4. floor(i/5), i%5