TED-Ed: Can you solve the fortress riddle? | Henri Picciotto

The kingdom is under threat from neighboring states that aim to breach its walls using siege weapons. The kingdom must determine the optimal wall segment size that cannot be destroyed by any combination of enemy wall busters. The Sieve of Eratosthenes, a method for identifying prime numbers, is adapted to solve this problem efficiently. By eliminating vulnerable wall sizes, the kingdom identifies 43 meters as the optimal wall segment length, ensuring its defense against the siege.

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