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HMMT 2016 C8

  • Combinatorics
  • Answer

Let XX be the collection of all functions f:{0,1,…,2016}→{0,1,…,2016}f:\{0,1, \ldots, 2016\} \rightarrow\{0,1, \ldots, 2016\}. Compute the number of functions f∈Xf \in X such that

max⁡g∈X(min⁡0≤i≤2016(max⁡(f(i),g(i)))−max⁡0≤i≤2016(min⁡(f(i),g(i))))=2015.\max _{g \in X}\left(\min _{0 \leq i \leq 2016}(\max (f(i), g(i)))-\max _{0 \leq i \leq 2016}(\min (f(i), g(i)))\right)=2015 .

Dataset text NuminaMath olympiads. Quoted with source.

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2 \cdot\left(3^{2017}-2^{2017}\right)

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