题解 | #筛选法求素数#

int main()
{
    int n;
    scanf("%d", &n);
    int arr[101] = {0};
    int i, j;
    int count = 0;
    for(i=2; i<=n; i++)
        arr[i] = i;
    for(i=2; i<=n; i++)
    {
        for(j=i+1; j<=n; j++)
        {
            if(arr[j]%i == 0 && arr[j])
            {
                arr[j] = 0;
                count++;
            }
        }
    }
    for(i=2; i<=n; i++)
    {
        if(arr[i] != 0)
            printf("%d ", arr[i]);
    }
    printf("\n%d", count);
    return 0;
}