[](https://open.kattis.com/contests/asiasg18-prelim-open/standings) How to solve D and E, I tried but failed.
[](https://open.kattis.com/contests/asiasg18-prelim-open/standings) How to solve D and E, I tried but failed.
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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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