Count the number of prime numbers less than a non-negative number, n.
Input: n = 10
Output: 4
Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7.
Input: n = 0
Output: 0
Input: n = 1
Output: 0
0204.Count-primes
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0204.Count-primes
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