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EDIT: I got it. It turns out that in the calculation of g=2, I overcount the pairs that have 4 as a gcd and I count them as having 2 as a gcd... In the ans[4], they are divided by 4 (their gcd), so to remove the overcounting I multiply the ans[4] by 2. |
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Why do you need to, if for example g=2, to exclude twice the answer of 4? |
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