YeuDieuNhieu's blog

By YeuDieuNhieu, history, 6 years ago, In English
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By YeuDieuNhieu, history, 6 years ago, In English

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My solution: f[i] = f[i-1]+i with f[2]=4, but I'm not sure my solution is correct. Anyone here tell me which problem on any online judge similar with the beyond problem?

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