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#include<iostream>
using namespace std;
//改进, 去掉偶数的判断
bool isPrime(int n)
{
if(n < 2) return false;
if(n == 2) return true;
if(n % 2 == 0) return false;
for(int i = 3; i < n; i += 2)
if(n%i == 0) return false;
return true;
}
//时间复杂度O(n/2), 速度提高一倍.
int main()
{
for(int i=0;i<100;i++)
{
if(isPrime(i))
{
cout<<i<<endl;
}
}
return 0;
}