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Synthetic 4 · Serpentine Number Blocks

89 words

1 min read

2026-08-02

Serpentine Number Blocks

Write serpentine_blocks(n) returning an n × n list. Fill consecutive integers starting at 1. Odd-numbered rows go left-to-right; even-numbered rows reverse their block.

Template Code


python
def serpentine_blocks(n):
    pass

Public Tests

is_equal(serpentine_blocks(1), 1) is_equal(serpentine_blocks(3), [1, 2, 3], [6, 5, 4], [7, 8, 9](/viewer?path=1, 2, 3], [6, 5, 4], [7, 8, 9)) is_equal(serpentine_blocks(0), [])

MCQ

3 Unit Assessment

Reference-only archive item

The completed export preserved the prompt as an image but not a reusable answer key. The reconstruction below is for study, not scoring.

Study reconstruction

def serpentine_blocks(n):
    grid = []
    for row in range(n):
        block = list(range(row * n + 1, (row + 1) * n + 1))
        if row % 2 == 1:
            block.reverse()
        grid.append(block)
    return grid