Count Primes Total Accepted: 831 Total Submissions: 6167
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题目来自：Leetcode
https://leetcode.com/problems/count-primes/
Count Primes
Total Accepted: 831 Total Submissions: 6167My SubmissionsDescription:
Count the number of prime numbers less than a non-negative number, n
Hint: The number n could be in the order of 100,000 to 5,000,000.
click to show more hints.
References:
How Many Primes Are There?
Sieve of Eratosthenes
Credits:
Special thanks to @mithmatt for adding this problem and creating all test cases.
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class Solution {public: int countPrimes(int n) { if(n<=2) return 0; if(n==3) return 1; bitset<5000001> b; b.set(); b.reset(0); b.reset(1); int imax=sqrt(n)+1; int j; for(int i=2;i<=imax;++i) { if(b.test(i)==true) { j=i*i; while(j<n) { b.reset(j); // cout<<"j="<<j<<endl; j+=i; } } } b.flip(); return n-b.count(); }}; 0 0
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