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29 lines
603 B
29 lines
603 B
8 years ago
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# What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?
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# top right
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tr_sum = 1
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for i in range(1, 501):
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tr_sum += pow(i * 2 + 1, 2)
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# bottom right
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br_sum = 1
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br_tmp = 1
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for i in range(1, 501):
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br_tmp += 2 + 8 * (i-1)
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br_sum += br_tmp
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# bottom left
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bl_sum = 1
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for i in range(1, 501):
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bl_sum += pow(i * 2, 2) + 1
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# top left
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tl_sum = 1
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tl_tmp = 1
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for i in range(1, 501):
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tl_tmp += (i-1) * 8 + 6
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tl_sum += tl_tmp
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# I guess the problem is looking to not repeat the center case to take away 3
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print(tl_sum + bl_sum + br_sum + tr_sum - 3)
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