The answer
It requires coordinating three separate inner loops (left stars, middle spaces, right stars) per row, and mirroring the entire structure for the bottom half.
The Butterfly Star Pattern (Combining Triangles)
What makes the Butterfly pattern difficult?
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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