Web Reference: Count Primes - Given an integer n, return the number of prime numbers that are strictly less than n. Example 1: Input: n = 10 Output: 4 Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7. In-depth solution and explanation for LeetCode 204. Count Primes in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Using Python, we’ll dive into two solutions: Sieve of Eratosthenes (our best solution) and Trial Division (a simple alternative). With step-by-step examples, detailed code breakdowns, and beginner-friendly insights, you’ll master prime counting.
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