Comments
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A difficult div2, but nice problem
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Generally speaking, difficulty is ok, and solutions of problems are good, but A and B take more time to understand the meaning than to solve them, which I don't like. The style of problem D is not similar with common problems in codeforces, but I think it's a good problem. And I love problem E.
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I like problem D much
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C,D are good problems, and I like them much. However, I think it's not suitable to have these four problems as ABCD in div2, since they require no algorithm(need the thought of greedy, maybe)
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div2 D such an amazing problem. Once you find the key point by observation(the graph), you can immediately solve this problem