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MathNet 2026 — Part 09 Question 4

Math Olympiad Vault · MathNet 2026 — Part 09

Question 4

The country of Squareland is shaped like a square and is divided into $64$ congruent square cities. We want to divide Squareland into states and assign to each state a capital city so that the following rules are satisfied:


a. Every city lies entirely within one state.


b. Given any two states, the numbers of cities in them differ by at most $1$.


c. Any city in a state shares at least one corner with the state's capital.

What is the smallest possible number of states?