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204. Count Primes. Medium. 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. Example 2: Input: n = 0. Output: 0. Example 3: Input: n = 1. Output: 0. Constraints: 0 <= n <= 5 * 10 6. Accepted. 0.
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Nov 27, 2020 · 204. Count Primes. 2020, Nov 27 One min read. 1. Description. Count the number of prime numbers less than a non-negative number, n. 2. Example 1: Input: n = 10. Output: 4. Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7. Example 2: Input: n = 0. Output: 0. Example 3: Input: n = 1. Output: 0. 3. Constraints.
Jun 21, 2016 · 204. Count Primes. Description. 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. Example 2: Input: n = 0. Output: 0. Example 3: Input: n = 1. Output: 0. Constraints: 0 <= n <= 5 * 10 6. Solutions
204. Count Primes. Medium Array Math Enumeration Number Theory. Leetcode Link. Problem Description. The problem requires us to find the count of prime numbers less than a given integer n. Remember, a prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. Intuition.
204. Count Primes. Count the number of prime numbers less than a non-negative number, n. To verify a number is prime, you need to divide n by all the number less than n, to see if remainder is 0, in this case, for each number you need to calculate in such way, so the total complexity in time is O (n^2). There is a simple way, for each number ...
