Algorithm Application ScenariosThe Sieve of Eratosthenes efficiently solves problems related to recording prime numbers (including their quantities).Core ConceptEliminate composite numbers, keep prime numbers:If x is a prime number, then multiples of x must not be prime numbers. These numbers can be directly excluded without needing subsequent one-by-one traversal, thereby reducing efficiency losses.Since we need to record that multiples of x are not prime numbers, obviously before performing sieving, we must create a container to save the p...