Rivalry

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Dominater and Everule are very competitive, and keep trying to show that they are better at competitive programming than the other. What better measure is there than their rating? Both of them participated in a contest. Before the contest, Dominater's rating was $R_1$ and Everule's rating was $R_2$. Dominater's rating changed by $D_1$ in the contest, and Everule's rating changed by $D_2$. Who h

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solution.cppC++17

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