olymmath

CN-TST 2017 Problem 30

  • Test 5

We call a graph with n vertices k−flowing−chromatick-flowing-chromatic if:

  1. we can place a chess on each vertex and any two neighboring (connected by an edge) chesses have different colors.
  2. we can choose a hamilton cycle v1,v2,⋯ ,vnv_1,v_2,\cdots , v_n , and move the chess on viv_i to vi+1v_{i+1} with i=1,2,⋯ ,ni=1,2,\cdots ,n and vn+1=v1v_{n+1}=v_1 , such that any two neighboring chess also have different colors.
  3. after some action of step 2 we can make all the chess reach each of the n vertices. Let T(G) denote the least number k such that G is k-flowing-chromatic. If such k does not exist, denote T(G)=0. denote χ(G)\chi (G) the chromatic number of G. Find all the positive number m such that there is a graph G with χ(G)≤m\chi (G)\le m and T(G)≥2mT(G)\ge 2^m without a cycle of length small than 2017.

Dataset text AI-MO AoPS. Quoted with source.

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