13 lines
187 B
Julia
13 lines
187 B
Julia
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function solution(n)
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if n % 2 == 0
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return -1
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end
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if n == 1
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return 1
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else
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sum_n = 4*n^2 - 6*(n-1)
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return solution(n-2) + sum_n
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end
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end
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