根据这个帖子,我们可以通过以下代码得到一个数的所有约数.
According to this post, we can get all divisors of a number through the following codes.
for (int i = 1; i <= num; ++i){
if (num % i == 0)
cout << i << endl;
}
例如24
的除数是1 2 3 4 6 8 12 24
.
搜索了一些相关的帖子,没有找到好的解决办法.有什么有效的方法可以做到这一点吗?
After searching some related posts, I did not find any good solutions. Is there any efficient way to accomplish this?
我的解决方案:
然而,这似乎不是一个好方法.
However, it doesn't seem to be a good one.
因素是成对的.1
and 24
, 2
and 12
, 3
and 8
、4
和 6
.
Factors are paired. 1
and 24
, 2
and 12
, 3
and 8
, 4
and 6
.
算法的改进可能是迭代到 num
的平方根,而不是一直到 num
,然后使用 计算配对因子num/i
.
An improvement of your algorithm could be to iterate to the square root of num
instead of all the way to num
, and then calculate the paired factors using num / i
.
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