What makes the Butterfly pattern difficult?
It requires coordinating three separate inner loops (left stars, middle spaces, right stars) per row, and mirroring the entire structure for the bottom half.
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More FAQs in The Butterfly Star Pattern (Combining Triangles)
The total width is 2N. The stars take up 2 * row. Therefore, the formula for the remaining middle space is 2 * (N - row).
You copy the exact three inner loops from the top half, but place them inside an outer loop that iterates backwards from N-1 down to 1.
Yes, by generating a 2N x 2N grid and using if-else boundary checks on the diagonals, but the multi-loop segment approach is generally faster and easier to conceptualize.
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