Embercode: AI-powered software engineer course

1. What does this print? ``

python
rows, cols = 3, 5
flat = [0] * (rows * cols)
for r in range(rows):
    for c in range(cols):
        flat[r * cols + c] = r * 10 + c
print(flat[2 * cols + 1])

``

1112212

2. What does this print? ``

python
g = [[0] * 2, [0] * 4, [0] * 1]
total = 0
for r in range(len(g)):
    total += len(g[r])
print(len(g), total)

``

3 43 33 77 3

3. What does this print? ``

python
rows, cols = 3, 5
flat = [0] * (rows * cols)
for r in range(rows):
    for c in range(cols):
        flat[r * cols + c] = r * 10 + c
r, c = 0, 1
print(flat[c * cols + r])

``

11005

4. In row-major order, a grid with cols columns stores the cell at row r and column c at index r * ___ + c. Fill in the blank.

Type your answer.

5. Which Python operator gives the column of a flat index? Write it as index ___ cols, with the symbol only.

Type your answer.

Layout and object size