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Baltic Way 2022 · Problem 8

Combinatorics

For a natural number n≥3n\ge3, we draw n−3n-3 internal diagonals in a non self-intersecting, but not necessarily convex, nn-gon, cutting the nn-gon into n−2n-2 triangles. It is known that the value (in degrees) of any angle in any of these triangles is a natural number and no two of these angle values are equal. What is the largest possible value of nn?

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Topics

Graph theory · Pigeonhole and extremal arguments

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Contest context

Results from Baltic Way 2022

10 teams

Mean score
1.1 / 5
Scores of 4 or 5
0 / 10
Estonia
0 / 5

Score distribution

04
13
21
32
40
50
All team scores
TeamScore
Poland3 / 5
Germany1 / 5
Lithuania3 / 5
Estonia0 / 5
Denmark0 / 5
Latvia1 / 5
Sweden1 / 5
Norway2 / 5
Finland0 / 5
Iceland0 / 5